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Add v5.2.0-beta1 docs (#36338)

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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="Learn how and why we build nearly all our components responsively and with base and modifier classes.">
<meta name="author" content="Mark Otto, Jacob Thornton, and Bootstrap contributors">
<meta name="generator" content="Hugo 0.98.0">
<meta name="docsearch:language" content="en">
<meta name="docsearch:version" content="5.2">
<title>Components · Bootstrap v5.2</title>
<link rel="canonical" href="https://getbootstrap.com/docs/5.2/customize/components/"><link rel="preconnect" href="https://AK7KMZKZHQ-dsn.algolia.net" crossorigin>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@docsearch/css@3">
<link href="/docs/5.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-0evHe/X+R7YkIZDRvuzKMRqM+OrBnVFBL6DOitfPri4tjfHxaWutUpFmBp4vmVor" crossorigin="anonymous">
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<meta name="twitter:description" content="Learn how and why we build nearly all our components responsively and with base and modifier classes.">
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<meta property="og:url" content="https://getbootstrap.com/docs/5.2/customize/components/">
<meta property="og:title" content="Components">
<meta property="og:description" content="Learn how and why we build nearly all our components responsively and with base and modifier classes.">
<meta property="og:type" content="article">
<meta property="og:image" content="https://getbootstrap.com/docs/5.2/assets/brand/bootstrap-social.png">
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ga('set', 'anonymizeIp', true);
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</head>
<body>
<div class="skippy visually-hidden-focusable overflow-hidden">
<div class="container-xl">
<a class="d-inline-flex p-2 m-1" href="#content">Skip to main content</a>
<a class="d-none d-md-inline-flex p-2 m-1" href="#bd-docs-nav">Skip to docs navigation</a>
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<li><a href="/docs/5.2/utilities/api/" class="bd-links-link d-inline-block rounded">API</a></li>
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<h1 class="bd-title mb-0" id="content">Components</h1>
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<p class="bd-lead">Learn how and why we build nearly all our components responsively and with base and modifier classes.</p>
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<div class="collapse bd-toc-collapse" id="tocContents">
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<ul>
<li><a href="#base-classes">Base classes</a></li>
<li><a href="#modifiers">Modifiers</a></li>
<li><a href="#responsive">Responsive</a></li>
<li><a href="#creating-your-own">Creating your own</a></li>
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<h2 id="base-classes">Base classes <a class="anchor-link" href="#base-classes" aria-label="Link to this section: Base classes"></a></h2>
<p>Bootstrap&rsquo;s components are largely built with a base-modifier nomenclature. We group as many shared properties as possible into a base class, like <code>.btn</code>, and then group individual styles for each variant into modifier classes, like <code>.btn-primary</code> or <code>.btn-success</code>.</p>
<p>To build our modifier classes, we use Sass&rsquo;s <code>@each</code> loops to iterate over a Sass map. This is especially helpful for generating variants of a component by our <code>$theme-colors</code> and creating responsive variants for each breakpoint. As you customize these Sass maps and recompile, you&rsquo;ll automatically see your changes reflected in these loops.</p>
<p>Check out <a href="/docs/5.2/customize/sass/#maps-and-loops">our Sass maps and loops docs</a> for how to customize these loops and extend Bootstrap&rsquo;s base-modifier approach to your own code.</p>
<h2 id="modifiers">Modifiers <a class="anchor-link" href="#modifiers" aria-label="Link to this section: Modifiers"></a></h2>
<p>Many of Bootstrap&rsquo;s components are built with a base-modifier class approach. This means the bulk of the styling is contained to a base class (e.g., <code>.btn</code>) while style variations are confined to modifier classes (e.g., <code>.btn-danger</code>). These modifier classes are built from the <code>$theme-colors</code> map to make customizing the number and name of our modifier classes.</p>
<p>Here are two examples of how we loop over the <code>$theme-colors</code> map to generate modifiers to the <code>.alert</code> and <code>.list-group</code> components.</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="c1">// Generate contextual modifier classes for colorizing the alert.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>
</span></span><span class="line"><span class="cl"><span class="k">@each</span> <span class="nv">$state</span><span class="o">,</span> <span class="nv">$value</span> <span class="ow">in</span> <span class="nv">$theme-colors</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$alert-background</span><span class="o">:</span> <span class="nf">shift-color</span><span class="p">(</span><span class="nv">$value</span><span class="o">,</span> <span class="nv">$alert-bg-scale</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$alert-border</span><span class="o">:</span> <span class="nf">shift-color</span><span class="p">(</span><span class="nv">$value</span><span class="o">,</span> <span class="nv">$alert-border-scale</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$alert-color</span><span class="o">:</span> <span class="nf">shift-color</span><span class="p">(</span><span class="nv">$value</span><span class="o">,</span> <span class="nv">$alert-color-scale</span><span class="p">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="k">@if</span> <span class="p">(</span><span class="nf">contrast-ratio</span><span class="p">(</span><span class="nv">$alert-background</span><span class="o">,</span> <span class="nv">$alert-color</span><span class="p">)</span> <span class="o">&lt;</span> <span class="nv">$min-contrast-ratio</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$alert-color</span><span class="o">:</span> <span class="nf">mix</span><span class="p">(</span><span class="nv">$value</span><span class="o">,</span> <span class="nf">color-contrast</span><span class="p">(</span><span class="nv">$alert-background</span><span class="p">)</span><span class="o">,</span> <span class="nf">abs</span><span class="p">(</span><span class="nv">$alert-color-scale</span><span class="p">));</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl"> <span class="nc">.alert-</span><span class="si">#{</span><span class="nv">$state</span><span class="si">}</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">@include</span><span class="nd"> alert-variant</span><span class="p">(</span><span class="nv">$alert-background</span><span class="o">,</span> <span class="nv">$alert-border</span><span class="o">,</span> <span class="nv">$alert-color</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></div>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="c1">// List group contextual variants
</span></span></span><span class="line"><span class="cl"><span class="c1">//
</span></span></span><span class="line"><span class="cl"><span class="c1">// Add modifier classes to change text and background color on individual items.
</span></span></span><span class="line"><span class="cl"><span class="c1">// Organizationally, this must come after the `:hover` states.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>
</span></span><span class="line"><span class="cl"><span class="k">@each</span> <span class="nv">$state</span><span class="o">,</span> <span class="nv">$value</span> <span class="ow">in</span> <span class="nv">$theme-colors</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$list-group-variant-bg</span><span class="o">:</span> <span class="nf">shift-color</span><span class="p">(</span><span class="nv">$value</span><span class="o">,</span> <span class="nv">$list-group-item-bg-scale</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$list-group-variant-color</span><span class="o">:</span> <span class="nf">shift-color</span><span class="p">(</span><span class="nv">$value</span><span class="o">,</span> <span class="nv">$list-group-item-color-scale</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"> <span class="k">@if</span> <span class="p">(</span><span class="nf">contrast-ratio</span><span class="p">(</span><span class="nv">$list-group-variant-bg</span><span class="o">,</span> <span class="nv">$list-group-variant-color</span><span class="p">)</span> <span class="o">&lt;</span> <span class="nv">$min-contrast-ratio</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$list-group-variant-color</span><span class="o">:</span> <span class="nf">mix</span><span class="p">(</span><span class="nv">$value</span><span class="o">,</span> <span class="nf">color-contrast</span><span class="p">(</span><span class="nv">$list-group-variant-bg</span><span class="p">)</span><span class="o">,</span> <span class="nf">abs</span><span class="p">(</span><span class="nv">$list-group-item-color-scale</span><span class="p">));</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="k">@include</span><span class="nd"> list-group-item-variant</span><span class="p">(</span><span class="nv">$state</span><span class="o">,</span> <span class="nv">$list-group-variant-bg</span><span class="o">,</span> <span class="nv">$list-group-variant-color</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></div>
<h2 id="responsive">Responsive <a class="anchor-link" href="#responsive" aria-label="Link to this section: Responsive"></a></h2>
<p>These Sass loops aren&rsquo;t limited to color maps, either. You can also generate responsive variations of your components. Take for example our responsive alignment of the dropdowns where we mix an <code>@each</code> loop for the <code>$grid-breakpoints</code> Sass map with a media query include.</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="c1">// We deliberately hardcode the `bs-` prefix because we check
</span></span></span><span class="line"><span class="cl"><span class="c1">// this custom property in JS to determine Popper&#39;s positioning
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>
</span></span><span class="line"><span class="cl"><span class="k">@each</span> <span class="nv">$breakpoint</span> <span class="ow">in</span> <span class="nf">map-keys</span><span class="p">(</span><span class="nv">$grid-breakpoints</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">@include</span><span class="nd"> media-breakpoint-up</span><span class="p">(</span><span class="nv">$breakpoint</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="nv">$infix</span><span class="o">:</span> <span class="nf">breakpoint-infix</span><span class="p">(</span><span class="nv">$breakpoint</span><span class="o">,</span> <span class="nv">$grid-breakpoints</span><span class="p">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="nc">.dropdown-menu</span><span class="si">#{</span><span class="nv">$infix</span><span class="si">}</span><span class="nc">-start</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="na">--bs-position</span><span class="o">:</span> <span class="ni">start</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="k">&amp;</span><span class="o">[</span><span class="nt">data-bs-popper</span><span class="o">]</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="na">right</span><span class="o">:</span> <span class="ni">auto</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"> <span class="na">left</span><span class="o">:</span> <span class="mi">0</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="nc">.dropdown-menu</span><span class="si">#{</span><span class="nv">$infix</span><span class="si">}</span><span class="nc">-end</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="na">--bs-position</span><span class="o">:</span> <span class="ni">end</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="k">&amp;</span><span class="o">[</span><span class="nt">data-bs-popper</span><span class="o">]</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="na">right</span><span class="o">:</span> <span class="mi">0</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"> <span class="na">left</span><span class="o">:</span> <span class="ni">auto</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></div>
<p>Should you modify your <code>$grid-breakpoints</code>, your changes will apply to all the loops iterating over that map.</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="nv">$grid-breakpoints</span><span class="o">:</span> <span class="p">(</span>
</span></span><span class="line"><span class="cl"> <span class="na">xs</span><span class="o">:</span> <span class="mi">0</span><span class="o">,</span>
</span></span><span class="line"><span class="cl"> <span class="na">sm</span><span class="o">:</span> <span class="mi">576</span><span class="kt">px</span><span class="o">,</span>
</span></span><span class="line"><span class="cl"> <span class="na">md</span><span class="o">:</span> <span class="mi">768</span><span class="kt">px</span><span class="o">,</span>
</span></span><span class="line"><span class="cl"> <span class="na">lg</span><span class="o">:</span> <span class="mi">992</span><span class="kt">px</span><span class="o">,</span>
</span></span><span class="line"><span class="cl"> <span class="na">xl</span><span class="o">:</span> <span class="mi">1200</span><span class="kt">px</span><span class="o">,</span>
</span></span><span class="line"><span class="cl"> <span class="na">xxl</span><span class="o">:</span> <span class="mi">1400</span><span class="kt">px</span>
</span></span><span class="line"><span class="cl"><span class="p">);</span>
</span></span></code></pre></div>
<p>For more information and examples on how to modify our Sass maps and variables, please refer to <a href="/docs/5.2/layout/grid/#sass">the Sass section of the Grid documentation</a>.</p>
<h2 id="creating-your-own">Creating your own <a class="anchor-link" href="#creating-your-own" aria-label="Link to this section: Creating your own"></a></h2>
<p>We encourage you to adopt these guidelines when building with Bootstrap to create your own components. We&rsquo;ve extended this approach ourselves to the custom components in our documentation and examples. Components like our callouts are built just like our provided components with base and modifier classes.</p>
<div class="bd-example">
<div class="bd-callout my-0">
<strong>This is a callout.</strong> We built it custom for our docs so our messages to you stand out. It has three variants via modifier classes.
</div>
</div>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-html" data-lang="html"><span class="line"><span class="cl"><span class="p">&lt;</span><span class="nt">div</span> <span class="na">class</span><span class="o">=</span><span class="s">&#34;callout&#34;</span><span class="p">&gt;</span>...<span class="p">&lt;/</span><span class="nt">div</span><span class="p">&gt;</span>
</span></span></code></pre></div><p>In your CSS, you&rsquo;d have something like the following where the bulk of the styling is done via <code>.callout</code>. Then, the unique styles between each variant is controlled via modifier class.</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="c1">// Base class
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="nc">.callout</span> <span class="p">{}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// Modifier classes
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="nc">.callout-info</span> <span class="p">{}</span>
</span></span><span class="line"><span class="cl"><span class="nc">.callout-warning</span> <span class="p">{}</span>
</span></span><span class="line"><span class="cl"><span class="nc">.callout-danger</span> <span class="p">{}</span>
</span></span></code></pre></div><p>For the callouts, that unique styling is just a <code>border-left-color</code>. When you combine that base class with one of those modifier classes, you get your complete component family:</p>
<div class="bd-callout bd-callout-info">
<strong>This is an info callout.</strong> Example text to show it in action.
</div>
<div class="bd-callout bd-callout-warning">
<strong>This is a warning callout.</strong> Example text to show it in action.
</div>
<div class="bd-callout bd-callout-danger">
<strong>This is a danger callout.</strong> Example text to show it in action.
</div>
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<h1 class="bd-title mb-0" id="content">CSS variables</h1>
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<p class="bd-lead">Use Bootstrap&rsquo;s CSS custom properties for fast and forward-looking design and development.</p>
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<ul>
<li><a href="#root-variables">Root variables</a></li>
<li><a href="#component-variables">Component variables</a></li>
<li><a href="#prefix">Prefix</a></li>
<li><a href="#examples">Examples</a></li>
<li><a href="#grid-breakpoints">Grid breakpoints</a></li>
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<p>Bootstrap includes many <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/Using_CSS_custom_properties">CSS custom properties (variables)</a> in its compiled CSS for real-time customization without the need to recompile Sass. These provide easy access to commonly used values like our theme colors, breakpoints, and primary font stacks when working in your browser&rsquo;s inspector, a code sandbox, or general prototyping.</p>
<p><strong>All our custom properties are prefixed with <code>bs-</code></strong> to avoid conflicts with third party CSS.</p>
<h2 id="root-variables">Root variables <a class="anchor-link" href="#root-variables" aria-label="Link to this section: Root variables"></a></h2>
<p>Here are the variables we include (note that the <code>:root</code> is required) that can be accessed anywhere Bootstrap&rsquo;s CSS is loaded. They&rsquo;re located in our <code>_root.scss</code> file and included in our compiled dist files.</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-css" data-lang="css"><span class="line"><span class="cl"><span class="nt">:root {
--bs-blue: #0d6efd;
--bs-indigo: #6610f2;
--bs-purple: #6f42c1;
--bs-pink: #d63384;
--bs-red: #dc3545;
--bs-orange: #fd7e14;
--bs-yellow: #ffc107;
--bs-green: #198754;
--bs-teal: #20c997;
--bs-cyan: #0dcaf0;
--bs-black: #000;
--bs-white: #fff;
--bs-gray: #6c757d;
--bs-gray-dark: #343a40;
--bs-gray-100: #f8f9fa;
--bs-gray-200: #e9ecef;
--bs-gray-300: #dee2e6;
--bs-gray-400: #ced4da;
--bs-gray-500: #adb5bd;
--bs-gray-600: #6c757d;
--bs-gray-700: #495057;
--bs-gray-800: #343a40;
--bs-gray-900: #212529;
--bs-primary: #0d6efd;
--bs-secondary: #6c757d;
--bs-success: #198754;
--bs-info: #0dcaf0;
--bs-warning: #ffc107;
--bs-danger: #dc3545;
--bs-light: #f8f9fa;
--bs-dark: #212529;
--bs-primary-rgb: 13, 110, 253;
--bs-secondary-rgb: 108, 117, 125;
--bs-success-rgb: 25, 135, 84;
--bs-info-rgb: 13, 202, 240;
--bs-warning-rgb: 255, 193, 7;
--bs-danger-rgb: 220, 53, 69;
--bs-light-rgb: 248, 249, 250;
--bs-dark-rgb: 33, 37, 41;
--bs-white-rgb: 255, 255, 255;
--bs-black-rgb: 0, 0, 0;
--bs-body-color-rgb: 33, 37, 41;
--bs-body-bg-rgb: 255, 255, 255;
--bs-font-sans-serif: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", "Liberation Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
--bs-font-monospace: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
--bs-gradient: linear-gradient(180deg, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0));
--bs-body-font-family: var(--bs-font-sans-serif);
--bs-body-font-size: 1rem;
--bs-body-font-weight: 400;
--bs-body-line-height: 1.5;
--bs-body-color: #212529;
--bs-body-bg: #fff;
--bs-border-width: 1px;
--bs-border-style: solid;
--bs-border-color: #dee2e6;
--bs-border-color-translucent: rgba(0, 0, 0, 0.175);
--bs-border-radius: 0.375rem;
--bs-border-radius-sm: 0.25rem;
--bs-border-radius-lg: 0.5rem;
--bs-border-radius-xl: 1rem;
--bs-border-radius-2xl: 2rem;
--bs-border-radius-pill: 50rem;
--bs-heading-color: ;
--bs-link-color: #0d6efd;
--bs-link-hover-color: #0a58ca;
--bs-code-color: #d63384;
--bs-highlight-bg: #fff3cd;
}</span>
</span></span></code></pre></div><h2 id="component-variables">Component variables <a class="anchor-link" href="#component-variables" aria-label="Link to this section: Component variables"></a></h2>
<p>Bootstrap 5 is increasingly making use of custom properties as local variables for various components. This way we reduce our compiled CSS, ensure styles aren&rsquo;t inherited in places like nested tables, and allow some basic restyling and extending of Bootstrap components after Sass compilation.</p>
<p>Have a look at our table documentation for some <a href="/docs/5.2/content/tables/#how-do-the-variants-and-accented-tables-work">insight into how we&rsquo;re using CSS variables</a>. Our <a href="/docs/5.2/components/navbar/#css">navbars also use CSS variables</a> as of v5.2.0. We&rsquo;re also using CSS variables across our grids—primarily for gutters the <a href="/docs/5.2/layout/css-grid/">new opt-in CSS grid</a>—with more component usage coming in the future.</p>
<p>Whenever possible, we&rsquo;ll assign CSS variables at the base component level (e.g., <code>.navbar</code> for navbar and its sub-components). This reduces guessing on where and how to customize, and allows for easy modifications by our team in future updates.</p>
<h2 id="prefix">Prefix <a class="anchor-link" href="#prefix" aria-label="Link to this section: Prefix"></a></h2>
<p>Most CSS variables use a prefix to avoid collisions with your own codebase. This prefix is in addition to the <code>--</code> that&rsquo;s required on every CSS variable.</p>
<p>Customize the prefix via the <code>$prefix</code> Sass variable. By default, it&rsquo;s set to <code>bs-</code> (note the trailing dash).</p>
<h2 id="examples">Examples <a class="anchor-link" href="#examples" aria-label="Link to this section: Examples"></a></h2>
<p>CSS variables offer similar flexibility to Sass&rsquo;s variables, but without the need for compilation before being served to the browser. For example, here we&rsquo;re resetting our page&rsquo;s font and link styles with CSS variables.</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-css" data-lang="css"><span class="line"><span class="cl"><span class="nt">body</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">font</span><span class="p">:</span> <span class="mi">1</span><span class="kt">rem</span><span class="o">/</span><span class="mf">1.5</span> <span class="nf">var</span><span class="p">(</span><span class="o">--</span><span class="n">bs</span><span class="o">-</span><span class="n">font</span><span class="o">-</span><span class="kc">sans-serif</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span><span class="line"><span class="cl"><span class="nt">a</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">color</span><span class="p">:</span> <span class="nf">var</span><span class="p">(</span><span class="o">--</span><span class="n">bs</span><span class="o">-</span><span class="kc">blue</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></div><h2 id="grid-breakpoints">Grid breakpoints <a class="anchor-link" href="#grid-breakpoints" aria-label="Link to this section: Grid breakpoints"></a></h2>
<p>While we include our grid breakpoints as CSS variables (except for <code>xs</code>), be aware that <strong>CSS variables do not work in media queries</strong>. This is by design in the CSS spec for variables, but may change in coming years with support for <code>env()</code> variables. Check out <a href="https://stackoverflow.com/a/47212942">this Stack Overflow answer</a> for some helpful links. In the mean time, you can use these variables in other CSS situations, as well as in your JavaScript.</p>
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<strong class="bd-links-heading d-flex w-100 align-items-center fw-semibold">
<svg class="bi me-2" style="color: var(--bs-teal);" aria-hidden="true"><use xlink:href="#grid-fill"></use></svg>
Layout
</strong>
<ul class="list-unstyled fw-normal pb-2 small">
<li><a href="/docs/5.2/layout/breakpoints/" class="bd-links-link d-inline-block rounded">Breakpoints</a></li>
<li><a href="/docs/5.2/layout/containers/" class="bd-links-link d-inline-block rounded">Containers</a></li>
<li><a href="/docs/5.2/layout/grid/" class="bd-links-link d-inline-block rounded">Grid</a></li>
<li><a href="/docs/5.2/layout/columns/" class="bd-links-link d-inline-block rounded">Columns</a></li>
<li><a href="/docs/5.2/layout/gutters/" class="bd-links-link d-inline-block rounded">Gutters</a></li>
<li><a href="/docs/5.2/layout/utilities/" class="bd-links-link d-inline-block rounded">Utilities</a></li>
<li><a href="/docs/5.2/layout/z-index/" class="bd-links-link d-inline-block rounded">Z-index</a></li>
<li><a href="/docs/5.2/layout/css-grid/" class="bd-links-link d-inline-block rounded">CSS Grid</a></li>
</ul>
</li>
<li class="bd-links-group py-2">
<strong class="bd-links-heading d-flex w-100 align-items-center fw-semibold">
<svg class="bi me-2" style="color: var(--bs-gray);" aria-hidden="true"><use xlink:href="#file-earmark-richtext"></use></svg>
Content
</strong>
<ul class="list-unstyled fw-normal pb-2 small">
<li><a href="/docs/5.2/content/reboot/" class="bd-links-link d-inline-block rounded">Reboot</a></li>
<li><a href="/docs/5.2/content/typography/" class="bd-links-link d-inline-block rounded">Typography</a></li>
<li><a href="/docs/5.2/content/images/" class="bd-links-link d-inline-block rounded">Images</a></li>
<li><a href="/docs/5.2/content/tables/" class="bd-links-link d-inline-block rounded">Tables</a></li>
<li><a href="/docs/5.2/content/figures/" class="bd-links-link d-inline-block rounded">Figures</a></li>
</ul>
</li>
<li class="bd-links-group py-2">
<strong class="bd-links-heading d-flex w-100 align-items-center fw-semibold">
<svg class="bi me-2" style="color: var(--bs-blue);" aria-hidden="true"><use xlink:href="#ui-radios"></use></svg>
Forms
</strong>
<ul class="list-unstyled fw-normal pb-2 small">
<li><a href="/docs/5.2/forms/overview/" class="bd-links-link d-inline-block rounded">Overview</a></li>
<li><a href="/docs/5.2/forms/form-control/" class="bd-links-link d-inline-block rounded">Form control</a></li>
<li><a href="/docs/5.2/forms/select/" class="bd-links-link d-inline-block rounded">Select</a></li>
<li><a href="/docs/5.2/forms/checks-radios/" class="bd-links-link d-inline-block rounded">Checks &amp; radios</a></li>
<li><a href="/docs/5.2/forms/range/" class="bd-links-link d-inline-block rounded">Range</a></li>
<li><a href="/docs/5.2/forms/input-group/" class="bd-links-link d-inline-block rounded">Input group</a></li>
<li><a href="/docs/5.2/forms/floating-labels/" class="bd-links-link d-inline-block rounded">Floating labels</a></li>
<li><a href="/docs/5.2/forms/layout/" class="bd-links-link d-inline-block rounded">Layout</a></li>
<li><a href="/docs/5.2/forms/validation/" class="bd-links-link d-inline-block rounded">Validation</a></li>
</ul>
</li>
<li class="bd-links-group py-2">
<strong class="bd-links-heading d-flex w-100 align-items-center fw-semibold">
<svg class="bi me-2" style="color: var(--bs-cyan);" aria-hidden="true"><use xlink:href="#menu-button-wide-fill"></use></svg>
Components
</strong>
<ul class="list-unstyled fw-normal pb-2 small">
<li><a href="/docs/5.2/components/accordion/" class="bd-links-link d-inline-block rounded">Accordion</a></li>
<li><a href="/docs/5.2/components/alerts/" class="bd-links-link d-inline-block rounded">Alerts</a></li>
<li><a href="/docs/5.2/components/badge/" class="bd-links-link d-inline-block rounded">Badge</a></li>
<li><a href="/docs/5.2/components/breadcrumb/" class="bd-links-link d-inline-block rounded">Breadcrumb</a></li>
<li><a href="/docs/5.2/components/buttons/" class="bd-links-link d-inline-block rounded">Buttons</a></li>
<li><a href="/docs/5.2/components/button-group/" class="bd-links-link d-inline-block rounded">Button group</a></li>
<li><a href="/docs/5.2/components/card/" class="bd-links-link d-inline-block rounded">Card</a></li>
<li><a href="/docs/5.2/components/carousel/" class="bd-links-link d-inline-block rounded">Carousel</a></li>
<li><a href="/docs/5.2/components/close-button/" class="bd-links-link d-inline-block rounded">Close button</a></li>
<li><a href="/docs/5.2/components/collapse/" class="bd-links-link d-inline-block rounded">Collapse</a></li>
<li><a href="/docs/5.2/components/dropdowns/" class="bd-links-link d-inline-block rounded">Dropdowns</a></li>
<li><a href="/docs/5.2/components/list-group/" class="bd-links-link d-inline-block rounded">List group</a></li>
<li><a href="/docs/5.2/components/modal/" class="bd-links-link d-inline-block rounded">Modal</a></li>
<li><a href="/docs/5.2/components/navbar/" class="bd-links-link d-inline-block rounded">Navbar</a></li>
<li><a href="/docs/5.2/components/navs-tabs/" class="bd-links-link d-inline-block rounded">Navs &amp; tabs</a></li>
<li><a href="/docs/5.2/components/offcanvas/" class="bd-links-link d-inline-block rounded">Offcanvas</a></li>
<li><a href="/docs/5.2/components/pagination/" class="bd-links-link d-inline-block rounded">Pagination</a></li>
<li><a href="/docs/5.2/components/placeholders/" class="bd-links-link d-inline-block rounded">Placeholders</a></li>
<li><a href="/docs/5.2/components/popovers/" class="bd-links-link d-inline-block rounded">Popovers</a></li>
<li><a href="/docs/5.2/components/progress/" class="bd-links-link d-inline-block rounded">Progress</a></li>
<li><a href="/docs/5.2/components/scrollspy/" class="bd-links-link d-inline-block rounded">Scrollspy</a></li>
<li><a href="/docs/5.2/components/spinners/" class="bd-links-link d-inline-block rounded">Spinners</a></li>
<li><a href="/docs/5.2/components/toasts/" class="bd-links-link d-inline-block rounded">Toasts</a></li>
<li><a href="/docs/5.2/components/tooltips/" class="bd-links-link d-inline-block rounded">Tooltips</a></li>
</ul>
</li>
<li class="bd-links-group py-2">
<strong class="bd-links-heading d-flex w-100 align-items-center fw-semibold">
<svg class="bi me-2" style="color: var(--bs-orange);" aria-hidden="true"><use xlink:href="#magic"></use></svg>
Helpers
</strong>
<ul class="list-unstyled fw-normal pb-2 small">
<li><a href="/docs/5.2/helpers/clearfix/" class="bd-links-link d-inline-block rounded">Clearfix</a></li>
<li><a href="/docs/5.2/helpers/color-background/" class="bd-links-link d-inline-block rounded">Color &amp; background</a></li>
<li><a href="/docs/5.2/helpers/colored-links/" class="bd-links-link d-inline-block rounded">Colored links</a></li>
<li><a href="/docs/5.2/helpers/ratio/" class="bd-links-link d-inline-block rounded">Ratio</a></li>
<li><a href="/docs/5.2/helpers/position/" class="bd-links-link d-inline-block rounded">Position</a></li>
<li><a href="/docs/5.2/helpers/stacks/" class="bd-links-link d-inline-block rounded">Stacks</a></li>
<li><a href="/docs/5.2/helpers/visually-hidden/" class="bd-links-link d-inline-block rounded">Visually hidden</a></li>
<li><a href="/docs/5.2/helpers/stretched-link/" class="bd-links-link d-inline-block rounded">Stretched link</a></li>
<li><a href="/docs/5.2/helpers/text-truncation/" class="bd-links-link d-inline-block rounded">Text truncation</a></li>
<li><a href="/docs/5.2/helpers/vertical-rule/" class="bd-links-link d-inline-block rounded">Vertical rule</a></li>
</ul>
</li>
<li class="bd-links-group py-2">
<strong class="bd-links-heading d-flex w-100 align-items-center fw-semibold">
<svg class="bi me-2" style="color: var(--bs-red);" aria-hidden="true"><use xlink:href="#braces-asterisk"></use></svg>
Utilities
</strong>
<ul class="list-unstyled fw-normal pb-2 small">
<li><a href="/docs/5.2/utilities/api/" class="bd-links-link d-inline-block rounded">API</a></li>
<li><a href="/docs/5.2/utilities/background/" class="bd-links-link d-inline-block rounded">Background</a></li>
<li><a href="/docs/5.2/utilities/borders/" class="bd-links-link d-inline-block rounded">Borders</a></li>
<li><a href="/docs/5.2/utilities/colors/" class="bd-links-link d-inline-block rounded">Colors</a></li>
<li><a href="/docs/5.2/utilities/display/" class="bd-links-link d-inline-block rounded">Display</a></li>
<li><a href="/docs/5.2/utilities/flex/" class="bd-links-link d-inline-block rounded">Flex</a></li>
<li><a href="/docs/5.2/utilities/float/" class="bd-links-link d-inline-block rounded">Float</a></li>
<li><a href="/docs/5.2/utilities/interactions/" class="bd-links-link d-inline-block rounded">Interactions</a></li>
<li><a href="/docs/5.2/utilities/opacity/" class="bd-links-link d-inline-block rounded">Opacity</a></li>
<li><a href="/docs/5.2/utilities/overflow/" class="bd-links-link d-inline-block rounded">Overflow</a></li>
<li><a href="/docs/5.2/utilities/position/" class="bd-links-link d-inline-block rounded">Position</a></li>
<li><a href="/docs/5.2/utilities/shadows/" class="bd-links-link d-inline-block rounded">Shadows</a></li>
<li><a href="/docs/5.2/utilities/sizing/" class="bd-links-link d-inline-block rounded">Sizing</a></li>
<li><a href="/docs/5.2/utilities/spacing/" class="bd-links-link d-inline-block rounded">Spacing</a></li>
<li><a href="/docs/5.2/utilities/text/" class="bd-links-link d-inline-block rounded">Text</a></li>
<li><a href="/docs/5.2/utilities/vertical-align/" class="bd-links-link d-inline-block rounded">Vertical align</a></li>
<li><a href="/docs/5.2/utilities/visibility/" class="bd-links-link d-inline-block rounded">Visibility</a></li>
</ul>
</li>
<li class="bd-links-group py-2">
<strong class="bd-links-heading d-flex w-100 align-items-center fw-semibold">
<svg class="bi me-2" style="color: var(--bs-blue);" aria-hidden="true"><use xlink:href="#tools"></use></svg>
Extend
</strong>
<ul class="list-unstyled fw-normal pb-2 small">
<li><a href="/docs/5.2/extend/approach/" class="bd-links-link d-inline-block rounded">Approach</a></li>
<li><a href="/docs/5.2/extend/icons/" class="bd-links-link d-inline-block rounded">Icons</a></li>
</ul>
</li>
<li class="bd-links-group py-2">
<strong class="bd-links-heading d-flex w-100 align-items-center fw-semibold">
<svg class="bi me-2" style="color: var(--bs-indigo);" aria-hidden="true"><use xlink:href="#globe2"></use></svg>
About
</strong>
<ul class="list-unstyled fw-normal pb-2 small">
<li><a href="/docs/5.2/about/overview/" class="bd-links-link d-inline-block rounded">Overview</a></li>
<li><a href="/docs/5.2/about/team/" class="bd-links-link d-inline-block rounded">Team</a></li>
<li><a href="/docs/5.2/about/brand/" class="bd-links-link d-inline-block rounded">Brand</a></li>
<li><a href="/docs/5.2/about/license/" class="bd-links-link d-inline-block rounded">License</a></li>
<li><a href="/docs/5.2/about/translations/" class="bd-links-link d-inline-block rounded">Translations</a></li>
</ul>
</li>
<li class="bd-links-span-all mt-1 mb-3 mx-4 border-top"></li>
<li class="bd-links-span-all">
<a href="/docs/5.2/migration/" class="bd-links-link d-inline-block rounded small ">
Migration
</a>
</li>
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<main class="bd-main order-1">
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View on GitHub
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<h1 class="bd-title mb-0" id="content">Optimize</h1>
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<p class="bd-lead">Keep your projects lean, responsive, and maintainable so you can deliver the best experience and focus on more important jobs.</p>
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<nav id="TableOfContents">
<ul>
<li><a href="#lean-sass-imports">Lean Sass imports</a></li>
<li><a href="#lean-javascript">Lean JavaScript</a></li>
<li><a href="#autoprefixer-browserslistrc">Autoprefixer .browserslistrc</a></li>
<li><a href="#unused-css">Unused CSS</a></li>
<li><a href="#minify-and-gzip">Minify and gzip</a></li>
<li><a href="#non-blocking-files">Non-blocking files</a></li>
<li><a href="#always-use-https">Always use HTTPS</a></li>
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<div class="bd-content ps-lg-2">
<h2 id="lean-sass-imports">Lean Sass imports <a class="anchor-link" href="#lean-sass-imports" aria-label="Link to this section: Lean Sass imports"></a></h2>
<p>When using Sass in your asset pipeline, make sure you optimize Bootstrap by only <code>@import</code>ing the components you need. Your largest optimizations will likely come from the <code>Layout &amp; Components</code> section of our <code>bootstrap.scss</code>.</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="c1">// Configuration
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@import</span> <span class="s2">&#34;functions&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;variables&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;maps&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;mixins&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;utilities&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// Layout &amp; components
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@import</span> <span class="s2">&#34;root&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;reboot&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;type&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;images&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;containers&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;grid&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;tables&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;forms&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;buttons&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;transitions&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;dropdown&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;button-group&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;nav&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;navbar&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;card&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;accordion&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;breadcrumb&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;pagination&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;badge&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;alert&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;progress&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;list-group&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;close&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;toasts&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;modal&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;tooltip&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;popover&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;carousel&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;spinners&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;offcanvas&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;placeholders&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// Helpers
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@import</span> <span class="s2">&#34;helpers&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// Utilities
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@import</span> <span class="s2">&#34;utilities/api&#34;</span><span class="p">;</span>
</span></span></code></pre></div>
<p>If you&rsquo;re not using a component, comment it out or delete it entirely. For example, if you&rsquo;re not using the carousel, remove that import to save some file size in your compiled CSS. Keep in mind there are some dependencies across Sass imports that may make it more difficult to omit a file.</p>
<h2 id="lean-javascript">Lean JavaScript <a class="anchor-link" href="#lean-javascript" aria-label="Link to this section: Lean JavaScript"></a></h2>
<p>Bootstrap&rsquo;s JavaScript includes every component in our primary dist files (<code>bootstrap.js</code> and <code>bootstrap.min.js</code>), and even our primary dependency (Popper) with our bundle files (<code>bootstrap.bundle.js</code> and <code>bootstrap.bundle.min.js</code>). While you&rsquo;re customizing via Sass, be sure to remove related JavaScript.</p>
<p>For instance, assuming you&rsquo;re using your own JavaScript bundler like Webpack or Rollup, you&rsquo;d only import the JavaScript you plan on using. In the example below, we show how to just include our modal JavaScript:</p>
<!-- eslint-skip -->
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-js" data-lang="js"><span class="line"><span class="cl"><span class="c1">// Import just what we need
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>
</span></span><span class="line"><span class="cl"><span class="c1">// import &#39;bootstrap/js/dist/alert&#39;;
</span></span></span><span class="line"><span class="cl"><span class="c1">// import &#39;bootstrap/js/dist/button&#39;;
</span></span></span><span class="line"><span class="cl"><span class="c1">// import &#39;bootstrap/js/dist/carousel&#39;;
</span></span></span><span class="line"><span class="cl"><span class="c1">// import &#39;bootstrap/js/dist/collapse&#39;;
</span></span></span><span class="line"><span class="cl"><span class="c1">// import &#39;bootstrap/js/dist/dropdown&#39;;
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="kr">import</span> <span class="s1">&#39;bootstrap/js/dist/modal&#39;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="c1">// import &#39;bootstrap/js/dist/offcanvas&#39;;
</span></span></span><span class="line"><span class="cl"><span class="c1">// import &#39;bootstrap/js/dist/popover&#39;;
</span></span></span><span class="line"><span class="cl"><span class="c1">// import &#39;bootstrap/js/dist/scrollspy&#39;;
</span></span></span><span class="line"><span class="cl"><span class="c1">// import &#39;bootstrap/js/dist/tab&#39;;
</span></span></span><span class="line"><span class="cl"><span class="c1">// import &#39;bootstrap/js/dist/toast&#39;;
</span></span></span><span class="line"><span class="cl"><span class="c1">// import &#39;bootstrap/js/dist/tooltip&#39;;
</span></span></span></code></pre></div><p>This way, you&rsquo;re not including any JavaScript you don&rsquo;t intend to use for components like buttons, carousels, and tooltips. If you&rsquo;re importing dropdowns, tooltips or popovers, be sure to list the Popper dependency in your <code>package.json</code> file.</p>
<div class="bd-callout bd-callout-info">
<h3 id="default-exports">Default Exports <a class="anchor-link" href="#default-exports" aria-label="Link to this section: Default Exports"></a></h3>
<p>Files in <code>bootstrap/js/dist</code> use the <strong>default export</strong>, so if you want to use one of them you have to do the following:</p>
<!-- eslint-skip -->
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-js" data-lang="js"><span class="line"><span class="cl"><span class="kr">import</span> <span class="nx">Modal</span> <span class="nx">from</span> <span class="s1">&#39;bootstrap/js/dist/modal&#39;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="kr">const</span> <span class="nx">modal</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Modal</span><span class="p">(</span><span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">&#39;myModal&#39;</span><span class="p">))</span>
</span></span></code></pre></div>
</div>
<h2 id="autoprefixer-browserslistrc">Autoprefixer .browserslistrc <a class="anchor-link" href="#autoprefixer-browserslistrc" aria-label="Link to this section: Autoprefixer .browserslistrc"></a></h2>
<p>Bootstrap depends on Autoprefixer to automatically add browser prefixes to certain CSS properties. Prefixes are dictated by our <code>.browserslistrc</code> file, found in the root of the Bootstrap repo. Customizing this list of browsers and recompiling the Sass will automatically remove some CSS from your compiled CSS, if there are vendor prefixes unique to that browser or version.</p>
<h2 id="unused-css">Unused CSS <a class="anchor-link" href="#unused-css" aria-label="Link to this section: Unused CSS"></a></h2>
<p><em>Help wanted with this section, please consider opening a PR. Thanks!</em></p>
<p>While we don&rsquo;t have a prebuilt example for using <a href="https://github.com/FullHuman/purgecss">PurgeCSS</a> with Bootstrap, there are some helpful articles and walkthroughs that the community has written. Here are some options:</p>
<ul>
<li><a href="https://medium.com/dwarves-foundation/remove-unused-css-styles-from-bootstrap-using-purgecss-88395a2c5772">https://medium.com/dwarves-foundation/remove-unused-css-styles-from-bootstrap-using-purgecss-88395a2c5772</a></li>
<li><a href="https://lukelowrey.com/automatically-removeunused-css-from-bootstrap-or-other-frameworks/">https://lukelowrey.com/automatically-removeunused-css-from-bootstrap-or-other-frameworks/</a></li>
</ul>
<p>Lastly, this <a href="https://css-tricks.com/how-do-you-remove-unused-css-from-a-site/">CSS Tricks article on unused CSS</a> shows how to use PurgeCSS and other similar tools.</p>
<h2 id="minify-and-gzip">Minify and gzip <a class="anchor-link" href="#minify-and-gzip" aria-label="Link to this section: Minify and gzip"></a></h2>
<p>Whenever possible, be sure to compress all the code you serve to your visitors. If you&rsquo;re using Bootstrap dist files, try to stick to the minified versions (indicated by the <code>.min.css</code> and <code>.min.js</code> extensions). If you&rsquo;re building Bootstrap from the source with your own build system, be sure to implement your own minifiers for HTML, CSS, and JS.</p>
<h2 id="non-blocking-files">Non-blocking files <a class="anchor-link" href="#non-blocking-files" aria-label="Link to this section: Non-blocking files"></a></h2>
<p>While minifying and using compression might seem like enough, making your files non-blocking ones is also a big step in making your site well-optimized and fast enough.</p>
<p>If you are using a <a href="https://developers.google.com/web/tools/lighthouse/">Lighthouse</a> plugin in Google Chrome, you may have stumbled over FCP. <a href="https://web.dev/fcp/">The First Contentful Paint</a> metric measures the time from when the page starts loading to when any part of the page&rsquo;s content is rendered on the screen.</p>
<p>You can improve FCP by deferring non-critical JavaScript or CSS. What does that mean? Simply, JavaScript or stylesheets that don&rsquo;t need to be present on the first paint of your page should be marked with <code>async</code> or <code>defer</code> attributes.</p>
<p>This ensures that the less important resources are loaded later and not blocking the first paint. On the other hand, critical resources can be included as inline scripts or styles.</p>
<p>If you want to learn more about this, there are already a lot of great articles about it:</p>
<ul>
<li><a href="https://web.dev/render-blocking-resources/">https://web.dev/render-blocking-resources/</a></li>
<li><a href="https://web.dev/defer-non-critical-css/">https://web.dev/defer-non-critical-css/</a></li>
</ul>
<h2 id="always-use-https">Always use HTTPS <a class="anchor-link" href="#always-use-https" aria-label="Link to this section: Always use HTTPS"></a></h2>
<p>Your website should only be available over HTTPS connections in production. HTTPS improves the security, privacy, and availability of all sites, and <a href="https://https.cio.gov/everything/">there is no such thing as non-sensitive web traffic</a>. The steps to configure your website to be served exclusively over HTTPS vary widely depending on your architecture and web hosting provider, and thus are beyond the scope of these docs.</p>
<p>Sites served over HTTPS should also access all stylesheets, scripts, and other assets over HTTPS connections. Otherwise, you&rsquo;ll be sending users <a href="https://developer.mozilla.org/en-US/docs/Web/Security/Mixed_content">mixed active content</a>, leading to potential vulnerabilities where a site can be compromised by altering a dependency. This can lead to security issues and in-browser warnings displayed to users. Whether you&rsquo;re getting Bootstrap from a CDN or serving it yourself, ensure that you only access it over HTTPS connections.</p>
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<!doctype html>
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<meta name="description" content="Quickly customize Bootstrap with built-in variables to easily toggle global CSS preferences for controlling style and behavior.">
<meta name="author" content="Mark Otto, Jacob Thornton, and Bootstrap contributors">
<meta name="generator" content="Hugo 0.98.0">
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<meta name="docsearch:version" content="5.2">
<title>Options · Bootstrap v5.2</title>
<link rel="canonical" href="https://getbootstrap.com/docs/5.2/customize/options/"><link rel="preconnect" href="https://AK7KMZKZHQ-dsn.algolia.net" crossorigin>
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<a class="btn btn-sm btn-bd-light mb-3 mb-md-0 rounded-2" href="https://github.com/twbs/bootstrap/blob/main/site/content/docs/5.2/customize/options.md" title="View and edit this file on GitHub" target="_blank" rel="noopener">
View on GitHub
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<h1 class="bd-title mb-0" id="content">Options</h1>
</div>
<p class="bd-lead">Quickly customize Bootstrap with built-in variables to easily toggle global CSS preferences for controlling style and behavior.</p>
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</div>
<div class="bd-content ps-lg-2">
<p>Customize Bootstrap with our built-in custom variables file and easily toggle global CSS preferences with new <code>$enable-*</code> Sass variables. Override a variable&rsquo;s value and recompile with <code>npm run test</code> as needed.</p>
<p>You can find and customize these variables for key global options in Bootstrap&rsquo;s <code>scss/_variables.scss</code> file.</p>
<div class="table-responsive"><table class="table table-options">
<thead>
<tr>
<th>Variable</th>
<th>Values</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>$spacer</code></td>
<td><code>1rem</code> (default), or any value &gt; 0</td>
<td>Specifies the default spacer value to programmatically generate our <a href="/docs/5.2/utilities/spacing/">spacer utilities</a>.</td>
</tr>
<tr>
<td><code>$enable-rounded</code></td>
<td><code>true</code> (default) or <code>false</code></td>
<td>Enables predefined <code>border-radius</code> styles on various components.</td>
</tr>
<tr>
<td><code>$enable-shadows</code></td>
<td><code>true</code> or <code>false</code> (default)</td>
<td>Enables predefined decorative <code>box-shadow</code> styles on various components. Does not affect <code>box-shadow</code>s used for focus states.</td>
</tr>
<tr>
<td><code>$enable-gradients</code></td>
<td><code>true</code> or <code>false</code> (default)</td>
<td>Enables predefined gradients via <code>background-image</code> styles on various components.</td>
</tr>
<tr>
<td><code>$enable-transitions</code></td>
<td><code>true</code> (default) or <code>false</code></td>
<td>Enables predefined <code>transition</code>s on various components.</td>
</tr>
<tr>
<td><code>$enable-reduced-motion</code></td>
<td><code>true</code> (default) or <code>false</code></td>
<td>Enables the <a href="/docs/5.2/getting-started/accessibility/#reduced-motion"><code>prefers-reduced-motion</code> media query</a>, which suppresses certain animations/transitions based on the users&rsquo; browser/operating system preferences.</td>
</tr>
<tr>
<td><code>$enable-grid-classes</code></td>
<td><code>true</code> (default) or <code>false</code></td>
<td>Enables the generation of CSS classes for the grid system (e.g. <code>.row</code>, <code>.col-md-1</code>, etc.).</td>
</tr>
<tr>
<td><code>$enable-container-classes</code></td>
<td><code>true</code> (default) or <code>false</code></td>
<td>Enables the generation of CSS classes for layout containers. (New in v5.2.0)</td>
</tr>
<tr>
<td><code>$enable-caret</code></td>
<td><code>true</code> (default) or <code>false</code></td>
<td>Enables pseudo element caret on <code>.dropdown-toggle</code>.</td>
</tr>
<tr>
<td><code>$enable-button-pointers</code></td>
<td><code>true</code> (default) or <code>false</code></td>
<td>Add &ldquo;hand&rdquo; cursor to non-disabled button elements.</td>
</tr>
<tr>
<td><code>$enable-rfs</code></td>
<td><code>true</code> (default) or <code>false</code></td>
<td>Globally enables <a href="/docs/5.2/getting-started/rfs/">RFS</a>.</td>
</tr>
<tr>
<td><code>$enable-validation-icons</code></td>
<td><code>true</code> (default) or <code>false</code></td>
<td>Enables <code>background-image</code> icons within textual inputs and some custom forms for validation states.</td>
</tr>
<tr>
<td><code>$enable-negative-margins</code></td>
<td><code>true</code> or <code>false</code> (default)</td>
<td>Enables the generation of <a href="/docs/5.2/utilities/spacing/#negative-margin">negative margin utilities</a>.</td>
</tr>
<tr>
<td><code>$enable-deprecation-messages</code></td>
<td><code>true</code> (default) or <code>false</code></td>
<td>Set to <code>false</code> to hide warnings when using any of the deprecated mixins and functions that are planned to be removed in <code>v6</code>.</td>
</tr>
<tr>
<td><code>$enable-important-utilities</code></td>
<td><code>true</code> (default) or <code>false</code></td>
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<td><code>$enable-smooth-scroll</code></td>
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<li><a href="/docs/5.2/customize/components/" class="bd-links-link d-inline-block rounded">Components</a></li>
<li><a href="/docs/5.2/customize/css-variables/" class="bd-links-link d-inline-block rounded">CSS variables</a></li>
<li><a href="/docs/5.2/customize/optimize/" class="bd-links-link d-inline-block rounded">Optimize</a></li>
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<svg class="bi me-2" style="color: var(--bs-teal);" aria-hidden="true"><use xlink:href="#grid-fill"></use></svg>
Layout
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<li><a href="/docs/5.2/layout/breakpoints/" class="bd-links-link d-inline-block rounded">Breakpoints</a></li>
<li><a href="/docs/5.2/layout/containers/" class="bd-links-link d-inline-block rounded">Containers</a></li>
<li><a href="/docs/5.2/layout/grid/" class="bd-links-link d-inline-block rounded">Grid</a></li>
<li><a href="/docs/5.2/layout/columns/" class="bd-links-link d-inline-block rounded">Columns</a></li>
<li><a href="/docs/5.2/layout/gutters/" class="bd-links-link d-inline-block rounded">Gutters</a></li>
<li><a href="/docs/5.2/layout/utilities/" class="bd-links-link d-inline-block rounded">Utilities</a></li>
<li><a href="/docs/5.2/layout/z-index/" class="bd-links-link d-inline-block rounded">Z-index</a></li>
<li><a href="/docs/5.2/layout/css-grid/" class="bd-links-link d-inline-block rounded">CSS Grid</a></li>
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Content
</strong>
<ul class="list-unstyled fw-normal pb-2 small">
<li><a href="/docs/5.2/content/reboot/" class="bd-links-link d-inline-block rounded">Reboot</a></li>
<li><a href="/docs/5.2/content/typography/" class="bd-links-link d-inline-block rounded">Typography</a></li>
<li><a href="/docs/5.2/content/images/" class="bd-links-link d-inline-block rounded">Images</a></li>
<li><a href="/docs/5.2/content/tables/" class="bd-links-link d-inline-block rounded">Tables</a></li>
<li><a href="/docs/5.2/content/figures/" class="bd-links-link d-inline-block rounded">Figures</a></li>
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<svg class="bi me-2" style="color: var(--bs-blue);" aria-hidden="true"><use xlink:href="#ui-radios"></use></svg>
Forms
</strong>
<ul class="list-unstyled fw-normal pb-2 small">
<li><a href="/docs/5.2/forms/overview/" class="bd-links-link d-inline-block rounded">Overview</a></li>
<li><a href="/docs/5.2/forms/form-control/" class="bd-links-link d-inline-block rounded">Form control</a></li>
<li><a href="/docs/5.2/forms/select/" class="bd-links-link d-inline-block rounded">Select</a></li>
<li><a href="/docs/5.2/forms/checks-radios/" class="bd-links-link d-inline-block rounded">Checks &amp; radios</a></li>
<li><a href="/docs/5.2/forms/range/" class="bd-links-link d-inline-block rounded">Range</a></li>
<li><a href="/docs/5.2/forms/input-group/" class="bd-links-link d-inline-block rounded">Input group</a></li>
<li><a href="/docs/5.2/forms/floating-labels/" class="bd-links-link d-inline-block rounded">Floating labels</a></li>
<li><a href="/docs/5.2/forms/layout/" class="bd-links-link d-inline-block rounded">Layout</a></li>
<li><a href="/docs/5.2/forms/validation/" class="bd-links-link d-inline-block rounded">Validation</a></li>
</ul>
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<li class="bd-links-group py-2">
<strong class="bd-links-heading d-flex w-100 align-items-center fw-semibold">
<svg class="bi me-2" style="color: var(--bs-cyan);" aria-hidden="true"><use xlink:href="#menu-button-wide-fill"></use></svg>
Components
</strong>
<ul class="list-unstyled fw-normal pb-2 small">
<li><a href="/docs/5.2/components/accordion/" class="bd-links-link d-inline-block rounded">Accordion</a></li>
<li><a href="/docs/5.2/components/alerts/" class="bd-links-link d-inline-block rounded">Alerts</a></li>
<li><a href="/docs/5.2/components/badge/" class="bd-links-link d-inline-block rounded">Badge</a></li>
<li><a href="/docs/5.2/components/breadcrumb/" class="bd-links-link d-inline-block rounded">Breadcrumb</a></li>
<li><a href="/docs/5.2/components/buttons/" class="bd-links-link d-inline-block rounded">Buttons</a></li>
<li><a href="/docs/5.2/components/button-group/" class="bd-links-link d-inline-block rounded">Button group</a></li>
<li><a href="/docs/5.2/components/card/" class="bd-links-link d-inline-block rounded">Card</a></li>
<li><a href="/docs/5.2/components/carousel/" class="bd-links-link d-inline-block rounded">Carousel</a></li>
<li><a href="/docs/5.2/components/close-button/" class="bd-links-link d-inline-block rounded">Close button</a></li>
<li><a href="/docs/5.2/components/collapse/" class="bd-links-link d-inline-block rounded">Collapse</a></li>
<li><a href="/docs/5.2/components/dropdowns/" class="bd-links-link d-inline-block rounded">Dropdowns</a></li>
<li><a href="/docs/5.2/components/list-group/" class="bd-links-link d-inline-block rounded">List group</a></li>
<li><a href="/docs/5.2/components/modal/" class="bd-links-link d-inline-block rounded">Modal</a></li>
<li><a href="/docs/5.2/components/navbar/" class="bd-links-link d-inline-block rounded">Navbar</a></li>
<li><a href="/docs/5.2/components/navs-tabs/" class="bd-links-link d-inline-block rounded">Navs &amp; tabs</a></li>
<li><a href="/docs/5.2/components/offcanvas/" class="bd-links-link d-inline-block rounded">Offcanvas</a></li>
<li><a href="/docs/5.2/components/pagination/" class="bd-links-link d-inline-block rounded">Pagination</a></li>
<li><a href="/docs/5.2/components/placeholders/" class="bd-links-link d-inline-block rounded">Placeholders</a></li>
<li><a href="/docs/5.2/components/popovers/" class="bd-links-link d-inline-block rounded">Popovers</a></li>
<li><a href="/docs/5.2/components/progress/" class="bd-links-link d-inline-block rounded">Progress</a></li>
<li><a href="/docs/5.2/components/scrollspy/" class="bd-links-link d-inline-block rounded">Scrollspy</a></li>
<li><a href="/docs/5.2/components/spinners/" class="bd-links-link d-inline-block rounded">Spinners</a></li>
<li><a href="/docs/5.2/components/toasts/" class="bd-links-link d-inline-block rounded">Toasts</a></li>
<li><a href="/docs/5.2/components/tooltips/" class="bd-links-link d-inline-block rounded">Tooltips</a></li>
</ul>
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<strong class="bd-links-heading d-flex w-100 align-items-center fw-semibold">
<svg class="bi me-2" style="color: var(--bs-orange);" aria-hidden="true"><use xlink:href="#magic"></use></svg>
Helpers
</strong>
<ul class="list-unstyled fw-normal pb-2 small">
<li><a href="/docs/5.2/helpers/clearfix/" class="bd-links-link d-inline-block rounded">Clearfix</a></li>
<li><a href="/docs/5.2/helpers/color-background/" class="bd-links-link d-inline-block rounded">Color &amp; background</a></li>
<li><a href="/docs/5.2/helpers/colored-links/" class="bd-links-link d-inline-block rounded">Colored links</a></li>
<li><a href="/docs/5.2/helpers/ratio/" class="bd-links-link d-inline-block rounded">Ratio</a></li>
<li><a href="/docs/5.2/helpers/position/" class="bd-links-link d-inline-block rounded">Position</a></li>
<li><a href="/docs/5.2/helpers/stacks/" class="bd-links-link d-inline-block rounded">Stacks</a></li>
<li><a href="/docs/5.2/helpers/visually-hidden/" class="bd-links-link d-inline-block rounded">Visually hidden</a></li>
<li><a href="/docs/5.2/helpers/stretched-link/" class="bd-links-link d-inline-block rounded">Stretched link</a></li>
<li><a href="/docs/5.2/helpers/text-truncation/" class="bd-links-link d-inline-block rounded">Text truncation</a></li>
<li><a href="/docs/5.2/helpers/vertical-rule/" class="bd-links-link d-inline-block rounded">Vertical rule</a></li>
</ul>
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<li class="bd-links-group py-2">
<strong class="bd-links-heading d-flex w-100 align-items-center fw-semibold">
<svg class="bi me-2" style="color: var(--bs-red);" aria-hidden="true"><use xlink:href="#braces-asterisk"></use></svg>
Utilities
</strong>
<ul class="list-unstyled fw-normal pb-2 small">
<li><a href="/docs/5.2/utilities/api/" class="bd-links-link d-inline-block rounded">API</a></li>
<li><a href="/docs/5.2/utilities/background/" class="bd-links-link d-inline-block rounded">Background</a></li>
<li><a href="/docs/5.2/utilities/borders/" class="bd-links-link d-inline-block rounded">Borders</a></li>
<li><a href="/docs/5.2/utilities/colors/" class="bd-links-link d-inline-block rounded">Colors</a></li>
<li><a href="/docs/5.2/utilities/display/" class="bd-links-link d-inline-block rounded">Display</a></li>
<li><a href="/docs/5.2/utilities/flex/" class="bd-links-link d-inline-block rounded">Flex</a></li>
<li><a href="/docs/5.2/utilities/float/" class="bd-links-link d-inline-block rounded">Float</a></li>
<li><a href="/docs/5.2/utilities/interactions/" class="bd-links-link d-inline-block rounded">Interactions</a></li>
<li><a href="/docs/5.2/utilities/opacity/" class="bd-links-link d-inline-block rounded">Opacity</a></li>
<li><a href="/docs/5.2/utilities/overflow/" class="bd-links-link d-inline-block rounded">Overflow</a></li>
<li><a href="/docs/5.2/utilities/position/" class="bd-links-link d-inline-block rounded">Position</a></li>
<li><a href="/docs/5.2/utilities/shadows/" class="bd-links-link d-inline-block rounded">Shadows</a></li>
<li><a href="/docs/5.2/utilities/sizing/" class="bd-links-link d-inline-block rounded">Sizing</a></li>
<li><a href="/docs/5.2/utilities/spacing/" class="bd-links-link d-inline-block rounded">Spacing</a></li>
<li><a href="/docs/5.2/utilities/text/" class="bd-links-link d-inline-block rounded">Text</a></li>
<li><a href="/docs/5.2/utilities/vertical-align/" class="bd-links-link d-inline-block rounded">Vertical align</a></li>
<li><a href="/docs/5.2/utilities/visibility/" class="bd-links-link d-inline-block rounded">Visibility</a></li>
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<svg class="bi me-2" style="color: var(--bs-blue);" aria-hidden="true"><use xlink:href="#tools"></use></svg>
Extend
</strong>
<ul class="list-unstyled fw-normal pb-2 small">
<li><a href="/docs/5.2/extend/approach/" class="bd-links-link d-inline-block rounded">Approach</a></li>
<li><a href="/docs/5.2/extend/icons/" class="bd-links-link d-inline-block rounded">Icons</a></li>
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<svg class="bi me-2" style="color: var(--bs-indigo);" aria-hidden="true"><use xlink:href="#globe2"></use></svg>
About
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<li><a href="/docs/5.2/about/overview/" class="bd-links-link d-inline-block rounded">Overview</a></li>
<li><a href="/docs/5.2/about/team/" class="bd-links-link d-inline-block rounded">Team</a></li>
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<li><a href="/docs/5.2/about/translations/" class="bd-links-link d-inline-block rounded">Translations</a></li>
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<li class="bd-links-span-all mt-1 mb-3 mx-4 border-top"></li>
<li class="bd-links-span-all">
<a href="/docs/5.2/migration/" class="bd-links-link d-inline-block rounded small ">
Migration
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<main class="bd-main order-1">
<div class="bd-intro pt-2 ps-lg-2">
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<a class="btn btn-sm btn-bd-light mb-3 mb-md-0 rounded-2" href="https://github.com/twbs/bootstrap/blob/main/site/content/docs/5.2/customize/overview.md" title="View and edit this file on GitHub" target="_blank" rel="noopener">
View on GitHub
</a>
<h1 class="bd-title mb-0" id="content">Customize</h1>
</div>
<p class="bd-lead">Learn how to theme, customize, and extend Bootstrap with Sass, a boatload of global options, an expansive color system, and more.</p>
<script async src="https://cdn.carbonads.com/carbon.js?serve=CKYIKKJL&placement=getbootstrapcom" id="_carbonads_js"></script>
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<div class="bd-content ps-lg-2">
<div class="row g-3">
<div class="col-md-6">
<a class="d-block text-decoration-none" href="../sass/">
<strong class="d-block h5 mb-0">Sass</strong>
<span class="text-secondary">Utilize our source Sass files to take advantage of variables, maps, mixins, and functions.</span>
</a>
</div>
<div class="col-md-6">
<a class="d-block text-decoration-none" href="../options/">
<strong class="d-block h5 mb-0">Options</strong>
<span class="text-secondary">Customize Bootstrap with built-in variables to easily toggle global CSS preferences.</span>
</a>
</div>
<div class="col-md-6">
<a class="d-block text-decoration-none" href="../color/">
<strong class="d-block h5 mb-0">Color</strong>
<span class="text-secondary">Learn about and customize the color systems that support the entire toolkit.</span>
</a>
</div>
<div class="col-md-6">
<a class="d-block text-decoration-none" href="../components/">
<strong class="d-block h5 mb-0">Components</strong>
<span class="text-secondary">Learn how we build nearly all our components responsively and with base and modifier classes.</span>
</a>
</div>
<div class="col-md-6">
<a class="d-block text-decoration-none" href="../css-variables/">
<strong class="d-block h5 mb-0">CSS variables</strong>
<span class="text-secondary">Use Bootstrap&#39;s CSS custom properties for fast and forward-looking design and development.</span>
</a>
</div>
<div class="col-md-6">
<a class="d-block text-decoration-none" href="../optimize/">
<strong class="d-block h5 mb-0">Optimize</strong>
<span class="text-secondary">Keep your projects lean, responsive, and maintainable so you can deliver the best experience.</span>
</a>
</div>
</div>
<h2 id="overview">Overview <a class="anchor-link" href="#overview" aria-label="Link to this section: Overview"></a></h2>
<p>There are multiple ways to customize Bootstrap. Your best path can depend on your project, the complexity of your build tools, the version of Bootstrap you&rsquo;re using, browser support, and more.</p>
<p>Our two preferred methods are:</p>
<ol>
<li>Using Bootstrap <a href="/docs/5.2/getting-started/download/#package-managers">via package manager</a> so you can use and extend our source files.</li>
<li>Using Bootstrap&rsquo;s compiled distribution files or <a href="/docs/5.2/getting-started/download/#cdn-via-jsdelivr">jsDelivr</a> so you can add onto or override Bootstrap&rsquo;s styles.</li>
</ol>
<p>While we cannot go into details here on how to use every package manager, we can give some guidance on <a href="/docs/5.2/customize/sass/">using Bootstrap with your own Sass compiler</a>.</p>
<p>For those who want to use the distribution files, review the <a href="/docs/5.2/getting-started/introduction/">getting started page</a> for how to include those files and an example HTML page. From there, consult the docs for the layout, components, and behaviors you&rsquo;d like to use.</p>
<p>As you familiarize yourself with Bootstrap, continue exploring this section for more details on how to utilize our global options, making use of and changing our color system, how we build our components, how to use our growing list of CSS custom properties, and how to optimize your code when building with Bootstrap.</p>
<h2 id="csps-and-embedded-svgs">CSPs and embedded SVGs <a class="anchor-link" href="#csps-and-embedded-svgs" aria-label="Link to this section: CSPs and embedded SVGs"></a></h2>
<p>Several Bootstrap components include embedded SVGs in our CSS to style components consistently and easily across browsers and devices. <strong>For organizations with more strict <abbr title="Content Security Policy">CSP</abbr> configurations</strong>, we&rsquo;ve documented all instances of our embedded SVGs (all of which are applied via <code>background-image</code>) so you can more thoroughly review your options.</p>
<ul>
<li><a href="/docs/5.2/components/accordion/">Accordion</a></li>
<li><a href="/docs/5.2/components/carousel/#with-controls">Carousel controls</a></li>
<li><a href="/docs/5.2/components/close-button/">Close button</a> (used in alerts and modals)</li>
<li><a href="/docs/5.2/forms/checks-radios/">Form checkboxes and radio buttons</a></li>
<li><a href="/docs/5.2/forms/checks-radios/#switches">Form switches</a></li>
<li><a href="/docs/5.2/forms/validation/#server-side">Form validation icons</a></li>
<li><a href="/docs/5.2/components/navbar/#responsive-behaviors">Navbar toggle buttons</a></li>
<li><a href="/docs/5.2/forms/select/">Select menus</a></li>
</ul>
<p>Based on <a href="https://github.com/twbs/bootstrap/issues/25394">community conversation</a>, some options for addressing this in your own codebase include replacing the URLs with locally hosted assets, removing the images and using inline images (not possible in all components), and modifying your CSP. Our recommendation is to carefully review your own security policies and decide on the best path forward, if necessary.</p>
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<meta name="description" content="Utilize our source Sass files to take advantage of variables, maps, mixins, and functions to help you build faster and customize your project.">
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<li><a href="/docs/5.2/components/card/" class="bd-links-link d-inline-block rounded">Card</a></li>
<li><a href="/docs/5.2/components/carousel/" class="bd-links-link d-inline-block rounded">Carousel</a></li>
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<li><a href="/docs/5.2/components/navs-tabs/" class="bd-links-link d-inline-block rounded">Navs &amp; tabs</a></li>
<li><a href="/docs/5.2/components/offcanvas/" class="bd-links-link d-inline-block rounded">Offcanvas</a></li>
<li><a href="/docs/5.2/components/pagination/" class="bd-links-link d-inline-block rounded">Pagination</a></li>
<li><a href="/docs/5.2/components/placeholders/" class="bd-links-link d-inline-block rounded">Placeholders</a></li>
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<li><a href="/docs/5.2/components/toasts/" class="bd-links-link d-inline-block rounded">Toasts</a></li>
<li><a href="/docs/5.2/components/tooltips/" class="bd-links-link d-inline-block rounded">Tooltips</a></li>
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<svg class="bi me-2" style="color: var(--bs-orange);" aria-hidden="true"><use xlink:href="#magic"></use></svg>
Helpers
</strong>
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<li><a href="/docs/5.2/helpers/clearfix/" class="bd-links-link d-inline-block rounded">Clearfix</a></li>
<li><a href="/docs/5.2/helpers/color-background/" class="bd-links-link d-inline-block rounded">Color &amp; background</a></li>
<li><a href="/docs/5.2/helpers/colored-links/" class="bd-links-link d-inline-block rounded">Colored links</a></li>
<li><a href="/docs/5.2/helpers/ratio/" class="bd-links-link d-inline-block rounded">Ratio</a></li>
<li><a href="/docs/5.2/helpers/position/" class="bd-links-link d-inline-block rounded">Position</a></li>
<li><a href="/docs/5.2/helpers/stacks/" class="bd-links-link d-inline-block rounded">Stacks</a></li>
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<li><a href="/docs/5.2/helpers/stretched-link/" class="bd-links-link d-inline-block rounded">Stretched link</a></li>
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<li><a href="/docs/5.2/helpers/vertical-rule/" class="bd-links-link d-inline-block rounded">Vertical rule</a></li>
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Utilities
</strong>
<ul class="list-unstyled fw-normal pb-2 small">
<li><a href="/docs/5.2/utilities/api/" class="bd-links-link d-inline-block rounded">API</a></li>
<li><a href="/docs/5.2/utilities/background/" class="bd-links-link d-inline-block rounded">Background</a></li>
<li><a href="/docs/5.2/utilities/borders/" class="bd-links-link d-inline-block rounded">Borders</a></li>
<li><a href="/docs/5.2/utilities/colors/" class="bd-links-link d-inline-block rounded">Colors</a></li>
<li><a href="/docs/5.2/utilities/display/" class="bd-links-link d-inline-block rounded">Display</a></li>
<li><a href="/docs/5.2/utilities/flex/" class="bd-links-link d-inline-block rounded">Flex</a></li>
<li><a href="/docs/5.2/utilities/float/" class="bd-links-link d-inline-block rounded">Float</a></li>
<li><a href="/docs/5.2/utilities/interactions/" class="bd-links-link d-inline-block rounded">Interactions</a></li>
<li><a href="/docs/5.2/utilities/opacity/" class="bd-links-link d-inline-block rounded">Opacity</a></li>
<li><a href="/docs/5.2/utilities/overflow/" class="bd-links-link d-inline-block rounded">Overflow</a></li>
<li><a href="/docs/5.2/utilities/position/" class="bd-links-link d-inline-block rounded">Position</a></li>
<li><a href="/docs/5.2/utilities/shadows/" class="bd-links-link d-inline-block rounded">Shadows</a></li>
<li><a href="/docs/5.2/utilities/sizing/" class="bd-links-link d-inline-block rounded">Sizing</a></li>
<li><a href="/docs/5.2/utilities/spacing/" class="bd-links-link d-inline-block rounded">Spacing</a></li>
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Extend
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<li><a href="/docs/5.2/extend/approach/" class="bd-links-link d-inline-block rounded">Approach</a></li>
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<li><a href="/docs/5.2/about/overview/" class="bd-links-link d-inline-block rounded">Overview</a></li>
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<h1 class="bd-title mb-0" id="content">Sass</h1>
</div>
<p class="bd-lead">Utilize our source Sass files to take advantage of variables, maps, mixins, and functions to help you build faster and customize your project.</p>
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<div class="collapse bd-toc-collapse" id="tocContents">
<nav id="TableOfContents">
<ul>
<li><a href="#file-structure">File structure</a></li>
<li><a href="#importing">Importing</a></li>
<li><a href="#variable-defaults">Variable defaults</a></li>
<li><a href="#maps-and-loops">Maps and loops</a>
<ul>
<li><a href="#modify-map">Modify map</a></li>
<li><a href="#add-to-map">Add to map</a></li>
<li><a href="#remove-from-map">Remove from map</a></li>
</ul>
</li>
<li><a href="#required-keys">Required keys</a></li>
<li><a href="#functions">Functions</a>
<ul>
<li><a href="#colors">Colors</a></li>
<li><a href="#color-contrast">Color contrast</a></li>
<li><a href="#escape-svg">Escape SVG</a></li>
<li><a href="#add-and-subtract-functions">Add and Subtract functions</a></li>
</ul>
</li>
<li><a href="#mixins">Mixins</a>
<ul>
<li><a href="#color-schemes">Color schemes</a></li>
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<div class="bd-content ps-lg-2">
<p>Utilize our source Sass files to take advantage of variables, maps, mixins, and more.</p>
<h2 id="file-structure">File structure <a class="anchor-link" href="#file-structure" aria-label="Link to this section: File structure"></a></h2>
<p>Whenever possible, avoid modifying Bootstrap&rsquo;s core files. For Sass, that means creating your own stylesheet that imports Bootstrap so you can modify and extend it. Assuming you&rsquo;re using a package manager like npm, you&rsquo;ll have a file structure that looks like this:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-text" data-lang="text"><span class="line"><span class="cl">your-project/
</span></span><span class="line"><span class="cl">├── scss
</span></span><span class="line"><span class="cl">│ └── custom.scss
</span></span><span class="line"><span class="cl">└── node_modules/
</span></span><span class="line"><span class="cl"> └── bootstrap
</span></span><span class="line"><span class="cl"> ├── js
</span></span><span class="line"><span class="cl"> └── scss
</span></span></code></pre></div><p>If you&rsquo;ve downloaded our source files and aren&rsquo;t using a package manager, you&rsquo;ll want to manually setup something similar to that structure, keeping Bootstrap&rsquo;s source files separate from your own.</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-text" data-lang="text"><span class="line"><span class="cl">your-project/
</span></span><span class="line"><span class="cl">├── scss
</span></span><span class="line"><span class="cl">│ └── custom.scss
</span></span><span class="line"><span class="cl">└── bootstrap/
</span></span><span class="line"><span class="cl"> ├── js
</span></span><span class="line"><span class="cl"> └── scss
</span></span></code></pre></div><h2 id="importing">Importing <a class="anchor-link" href="#importing" aria-label="Link to this section: Importing"></a></h2>
<p>In your <code>custom.scss</code>, you&rsquo;ll import Bootstrap&rsquo;s source Sass files. You have two options: include all of Bootstrap, or pick the parts you need. We encourage the latter, though be aware there are some requirements and dependencies across our components. You also will need to include some JavaScript for our plugins.</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="c1">// Custom.scss
</span></span></span><span class="line"><span class="cl"><span class="c1">// Option A: Include all of Bootstrap
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>
</span></span><span class="line"><span class="cl"><span class="c1">// Include any default variable overrides here (though functions won&#39;t be available)
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/bootstrap&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// Then add additional custom code here
</span></span></span></code></pre></div><div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="c1">// Custom.scss
</span></span></span><span class="line"><span class="cl"><span class="c1">// Option B: Include parts of Bootstrap
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>
</span></span><span class="line"><span class="cl"><span class="c1">// 1. Include functions first (so you can manipulate colors, SVGs, calc, etc)
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/functions&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// 2. Include any default variable overrides here
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>
</span></span><span class="line"><span class="cl"><span class="c1">// 3. Include remainder of required Bootstrap stylesheets
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/variables&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// 4. Include any default map overrides here
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>
</span></span><span class="line"><span class="cl"><span class="c1">// 5. Include remainder of required parts
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/maps&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/mixins&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/root&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// 6. Optionally include any other parts as needed
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/utilities&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/reboot&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/type&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/images&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/containers&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/grid&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/helpers&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// 7. Optionally include utilities API last to generate classes based on the Sass map in `_utilities.scss`
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/utilities/api&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// 8. Add additional custom code here
</span></span></span></code></pre></div><p>With that setup in place, you can begin to modify any of the Sass variables and maps in your <code>custom.scss</code>. You can also start to add parts of Bootstrap under the <code>// Optional</code> section as needed. We suggest using the full import stack from our <code>bootstrap.scss</code> file as your starting point.</p>
<h2 id="variable-defaults">Variable defaults <a class="anchor-link" href="#variable-defaults" aria-label="Link to this section: Variable defaults"></a></h2>
<p>Every Sass variable in Bootstrap includes the <code>!default</code> flag allowing you to override the variable&rsquo;s default value in your own Sass without modifying Bootstrap&rsquo;s source code. Copy and paste variables as needed, modify their values, and remove the <code>!default</code> flag. If a variable has already been assigned, then it won&rsquo;t be re-assigned by the default values in Bootstrap.</p>
<p>You will find the complete list of Bootstrap&rsquo;s variables in <code>scss/_variables.scss</code>. Some variables are set to <code>null</code>, these variables don&rsquo;t output the property unless they are overridden in your configuration.</p>
<p>Variable overrides must come after our functions are imported, but before the rest of the imports.</p>
<p>Here&rsquo;s an example that changes the <code>background-color</code> and <code>color</code> for the <code>&lt;body&gt;</code> when importing and compiling Bootstrap via npm:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="c1">// Required
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/functions&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// Default variable overrides
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="nv">$body-bg</span><span class="o">:</span> <span class="mh">#000</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="nv">$body-color</span><span class="o">:</span> <span class="mh">#111</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// Required
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/variables&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/maps&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/mixins&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/root&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// Optional Bootstrap components here
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/reboot&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/type&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="c1">// etc
</span></span></span></code></pre></div><p>Repeat as necessary for any variable in Bootstrap, including the global options below.</p>
<div class="bd-callout bd-callout-info">
<strong>Get started with Bootstrap via npm with our starter project!</strong> Head to the <a href="https://github.com/twbs/bootstrap-npm-starter">twbs/bootstrap-npm-starter</a> template repository to see how to build and customize Bootstrap in your own npm project. Includes Sass compiler, Autoprefixer, Stylelint, PurgeCSS, and Bootstrap Icons.
</div>
<h2 id="maps-and-loops">Maps and loops <a class="anchor-link" href="#maps-and-loops" aria-label="Link to this section: Maps and loops"></a></h2>
<p>Bootstrap includes a handful of Sass maps, key value pairs that make it easier to generate families of related CSS. We use Sass maps for our colors, grid breakpoints, and more. Just like Sass variables, all Sass maps include the <code>!default</code> flag and can be overridden and extended.</p>
<p>Some of our Sass maps are merged into empty ones by default. This is done to allow easy expansion of a given Sass map, but comes at the cost of making <em>removing</em> items from a map slightly more difficult.</p>
<h3 id="modify-map">Modify map <a class="anchor-link" href="#modify-map" aria-label="Link to this section: Modify map"></a></h3>
<p>All variables in the <code>$theme-colors</code> map are defined as standalone variables. To modify an existing color in our <code>$theme-colors</code> map, add the following to your custom Sass file:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="nv">$primary</span><span class="o">:</span> <span class="mh">#0074d9</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="nv">$danger</span><span class="o">:</span> <span class="mh">#ff4136</span><span class="p">;</span>
</span></span></code></pre></div><p>Later on, these variables are set in Bootstrap&rsquo;s <code>$theme-colors</code> map:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="nv">$theme-colors</span><span class="o">:</span> <span class="p">(</span>
</span></span><span class="line"><span class="cl"> <span class="s2">&#34;primary&#34;</span><span class="o">:</span> <span class="nv">$primary</span><span class="o">,</span>
</span></span><span class="line"><span class="cl"> <span class="s2">&#34;danger&#34;</span><span class="o">:</span> <span class="nv">$danger</span>
</span></span><span class="line"><span class="cl"><span class="p">);</span>
</span></span></code></pre></div><h3 id="add-to-map">Add to map <a class="anchor-link" href="#add-to-map" aria-label="Link to this section: Add to map"></a></h3>
<p>Add new colors to <code>$theme-colors</code>, or any other map, by creating a new Sass map with your custom values and merging it with the original map. In this case, we&rsquo;ll create a new <code>$custom-colors</code> map and merge it with <code>$theme-colors</code>.</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="c1">// Create your own map
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="nv">$custom-colors</span><span class="o">:</span> <span class="p">(</span>
</span></span><span class="line"><span class="cl"> <span class="s2">&#34;custom-color&#34;</span><span class="o">:</span> <span class="mh">#900</span>
</span></span><span class="line"><span class="cl"><span class="p">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// Merge the maps
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="nv">$theme-colors</span><span class="o">:</span> <span class="nf">map-merge</span><span class="p">(</span><span class="nv">$theme-colors</span><span class="o">,</span> <span class="nv">$custom-colors</span><span class="p">);</span>
</span></span></code></pre></div><h3 id="remove-from-map">Remove from map <a class="anchor-link" href="#remove-from-map" aria-label="Link to this section: Remove from map"></a></h3>
<p>To remove colors from <code>$theme-colors</code>, or any other map, use <code>map-remove</code>. Be aware you must insert it between our requirements and options:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="c1">// Required
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/functions&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/variables&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/maps&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/mixins&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/root&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="nv">$theme-colors</span><span class="o">:</span> <span class="nf">map-remove</span><span class="p">(</span><span class="nv">$theme-colors</span><span class="o">,</span> <span class="s2">&#34;info&#34;</span><span class="o">,</span> <span class="s2">&#34;light&#34;</span><span class="o">,</span> <span class="s2">&#34;dark&#34;</span><span class="p">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// Optional
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/reboot&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="k">@import</span> <span class="s2">&#34;../node_modules/bootstrap/scss/type&#34;</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="c1">// etc
</span></span></span></code></pre></div><h2 id="required-keys">Required keys <a class="anchor-link" href="#required-keys" aria-label="Link to this section: Required keys"></a></h2>
<p>Bootstrap assumes the presence of some specific keys within Sass maps as we used and extend these ourselves. As you customize the included maps, you may encounter errors where a specific Sass map&rsquo;s key is being used.</p>
<p>For example, we use the <code>primary</code>, <code>success</code>, and <code>danger</code> keys from <code>$theme-colors</code> for links, buttons, and form states. Replacing the values of these keys should present no issues, but removing them may cause Sass compilation issues. In these instances, you&rsquo;ll need to modify the Sass code that makes use of those values.</p>
<h2 id="functions">Functions <a class="anchor-link" href="#functions" aria-label="Link to this section: Functions"></a></h2>
<h3 id="colors">Colors <a class="anchor-link" href="#colors" aria-label="Link to this section: Colors"></a></h3>
<p>Next to the <a href="/docs/5.2/customize/color/#color-sass-maps">Sass maps</a> we have, theme colors can also be used as standalone variables, like <code>$primary</code>.</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="nc">.custom-element</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="na">color</span><span class="o">:</span> <span class="nv">$gray-100</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"> <span class="na">background-color</span><span class="o">:</span> <span class="nv">$dark</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></div><p>You can lighten or darken colors with Bootstrap&rsquo;s <code>tint-color()</code> and <code>shade-color()</code> functions. These functions will mix colors with black or white, unlike Sass&rsquo; native <code>lighten()</code> and <code>darken()</code> functions which will change the lightness by a fixed amount, which often doesn&rsquo;t lead to the desired effect.</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="c1">// Tint a color: mix a color with white
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@function</span><span class="nf"> tint-color</span><span class="p">(</span><span class="nv">$color</span><span class="o">,</span> <span class="nv">$weight</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">@return</span> <span class="nf">mix</span><span class="p">(</span><span class="ni">white</span><span class="o">,</span> <span class="nv">$color</span><span class="o">,</span> <span class="nv">$weight</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// Shade a color: mix a color with black
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@function</span><span class="nf"> shade-color</span><span class="p">(</span><span class="nv">$color</span><span class="o">,</span> <span class="nv">$weight</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">@return</span> <span class="nf">mix</span><span class="p">(</span><span class="no">black</span><span class="o">,</span> <span class="nv">$color</span><span class="o">,</span> <span class="nv">$weight</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="c1">// Shade the color if the weight is positive, else tint it
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">@function</span><span class="nf"> shift-color</span><span class="p">(</span><span class="nv">$color</span><span class="o">,</span> <span class="nv">$weight</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">@return</span> <span class="nf">if</span><span class="p">(</span><span class="nv">$weight</span> <span class="o">&gt;</span> <span class="mi">0</span><span class="o">,</span> <span class="nf">shade-color</span><span class="p">(</span><span class="nv">$color</span><span class="o">,</span> <span class="nv">$weight</span><span class="p">)</span><span class="o">,</span> <span class="nf">tint-color</span><span class="p">(</span><span class="nv">$color</span><span class="o">,</span> <span class="o">-</span><span class="nv">$weight</span><span class="p">));</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></div>
<p>In practice, you&rsquo;d call the function and pass in the color and weight parameters.</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="nc">.custom-element</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="na">color</span><span class="o">:</span> <span class="nf">tint-color</span><span class="p">(</span><span class="nv">$primary</span><span class="o">,</span> <span class="mi">10</span><span class="kt">%</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="nc">.custom-element-2</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="na">color</span><span class="o">:</span> <span class="nf">shade-color</span><span class="p">(</span><span class="nv">$danger</span><span class="o">,</span> <span class="mi">30</span><span class="kt">%</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></div><h3 id="color-contrast">Color contrast <a class="anchor-link" href="#color-contrast" aria-label="Link to this section: Color contrast"></a></h3>
<p>In order to meet <a href="https://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-contrast.html">WCAG 2.0 accessibility standards for color contrast</a>, authors <strong>must</strong> provide <a href="https://www.w3.org/WAI/WCAG20/quickref/20160105/Overview.php#visual-audio-contrast-contrast">a contrast ratio of at least 4.5:1</a>, with very few exceptions.</p>
<p>An additional function we include in Bootstrap is the color contrast function, <code>color-contrast</code>. It utilizes the <a href="https://www.w3.org/TR/WCAG20-TECHS/G17.html#G17-tests">WCAG 2.0 algorithm</a> for calculating contrast thresholds based on <a href="https://www.w3.org/WAI/GL/wiki/Relative_luminance">relative luminance</a> in a <code>sRGB</code> color space to automatically return a light (<code>#fff</code>), dark (<code>#212529</code>) or black (<code>#000</code>) contrast color based on the specified base color. This function is especially useful for mixins or loops where you&rsquo;re generating multiple classes.</p>
<p>For example, to generate color swatches from our <code>$theme-colors</code> map:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="k">@each</span> <span class="nv">$color</span><span class="o">,</span> <span class="nv">$value</span> <span class="ow">in</span> <span class="nv">$theme-colors</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="nc">.swatch-</span><span class="si">#{</span><span class="nv">$color</span><span class="si">}</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="na">color</span><span class="o">:</span> <span class="nf">color-contrast</span><span class="p">(</span><span class="nv">$value</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></div><p>It can also be used for one-off contrast needs:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="nc">.custom-element</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="na">color</span><span class="o">:</span> <span class="nf">color-contrast</span><span class="p">(</span><span class="mh">#000</span><span class="p">);</span> <span class="c1">// returns `color: #fff`
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="p">}</span>
</span></span></code></pre></div><p>You can also specify a base color with our color map functions:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="nc">.custom-element</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="na">color</span><span class="o">:</span> <span class="nf">color-contrast</span><span class="p">(</span><span class="nv">$dark</span><span class="p">);</span> <span class="c1">// returns `color: #fff`
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="p">}</span>
</span></span></code></pre></div><h3 id="escape-svg">Escape SVG <a class="anchor-link" href="#escape-svg" aria-label="Link to this section: Escape SVG"></a></h3>
<p>We use the <code>escape-svg</code> function to escape the <code>&lt;</code>, <code>&gt;</code> and <code>#</code> characters for SVG background images. When using the <code>escape-svg</code> function, data URIs must be quoted.</p>
<h3 id="add-and-subtract-functions">Add and Subtract functions <a class="anchor-link" href="#add-and-subtract-functions" aria-label="Link to this section: Add and Subtract functions"></a></h3>
<p>We use the <code>add</code> and <code>subtract</code> functions to wrap the CSS <code>calc</code> function. The primary purpose of these functions is to avoid errors when a &ldquo;unitless&rdquo; <code>0</code> value is passed into a <code>calc</code> expression. Expressions like <code>calc(10px - 0)</code> will return an error in all browsers, despite being mathematically correct.</p>
<p>Example where the calc is valid:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="nv">$border-radius</span><span class="o">:</span> <span class="mf">.25</span><span class="kt">rem</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="nv">$border-width</span><span class="o">:</span> <span class="mi">1</span><span class="kt">px</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="nc">.element</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="c1">// Output calc(.25rem - 1px) is valid
</span></span></span><span class="line"><span class="cl"><span class="c1"></span> <span class="na">border-radius</span><span class="o">:</span> <span class="nf">calc</span><span class="p">(</span><span class="nv">$border-radius</span> <span class="o">-</span> <span class="nv">$border-width</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="nc">.element</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="c1">// Output the same calc(.25rem - 1px) as above
</span></span></span><span class="line"><span class="cl"><span class="c1"></span> <span class="na">border-radius</span><span class="o">:</span> <span class="nf">subtract</span><span class="p">(</span><span class="nv">$border-radius</span><span class="o">,</span> <span class="nv">$border-width</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></div><p>Example where the calc is invalid:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="nv">$border-radius</span><span class="o">:</span> <span class="mf">.25</span><span class="kt">rem</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"><span class="nv">$border-width</span><span class="o">:</span> <span class="mi">0</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="nc">.element</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="c1">// Output calc(.25rem - 0) is invalid
</span></span></span><span class="line"><span class="cl"><span class="c1"></span> <span class="na">border-radius</span><span class="o">:</span> <span class="nf">calc</span><span class="p">(</span><span class="nv">$border-radius</span> <span class="o">-</span> <span class="nv">$border-width</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="nc">.element</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="c1">// Output .25rem
</span></span></span><span class="line"><span class="cl"><span class="c1"></span> <span class="na">border-radius</span><span class="o">:</span> <span class="nf">subtract</span><span class="p">(</span><span class="nv">$border-radius</span><span class="o">,</span> <span class="nv">$border-width</span><span class="p">);</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></div><h2 id="mixins">Mixins <a class="anchor-link" href="#mixins" aria-label="Link to this section: Mixins"></a></h2>
<p>Our <code>scss/mixins/</code> directory has a ton of mixins that power parts of Bootstrap and can also be used across your own project.</p>
<h3 id="color-schemes">Color schemes <a class="anchor-link" href="#color-schemes" aria-label="Link to this section: Color schemes"></a></h3>
<p>A shorthand mixin for the <code>prefers-color-scheme</code> media query is available with support for <code>light</code>, <code>dark</code>, and custom color schemes.</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="k">@mixin</span><span class="nf"> color-scheme</span><span class="p">(</span><span class="nv">$name</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">@media</span> <span class="p">(</span><span class="n">prefers-color-scheme</span><span class="o">:</span> <span class="si">#{</span><span class="nv">$name</span><span class="si">}</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">@content</span><span class="p">;</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></div>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="line"><span class="cl"><span class="nc">.custom-element</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="k">@include</span><span class="nd"> color-scheme</span><span class="p">(</span><span class="ni">dark</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="c1">// Insert dark mode styles here
</span></span></span><span class="line"><span class="cl"><span class="c1"></span> <span class="p">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"> <span class="k">@include</span><span class="nd"> color-scheme</span><span class="p">(</span><span class="n">custom-named-scheme</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="c1">// Insert custom color scheme styles here
</span></span></span><span class="line"><span class="cl"><span class="c1"></span> <span class="p">}</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></div>
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<h5>Guides</h5>
<ul class="list-unstyled">
<li class="mb-2"><a href="/docs/5.2/getting-started/">Getting started</a></li>
<li class="mb-2"><a href="/docs/5.2/examples/starter-template/">Starter template</a></li>
<li class="mb-2"><a href="/docs/5.2/getting-started/webpack/">Webpack</a></li>
<li class="mb-2"><a href="/docs/5.2/getting-started/parcel/">Parcel</a></li>
</ul>
</div>
<div class="col-6 col-lg-2 mb-3">
<h5>Projects</h5>
<ul class="list-unstyled">
<li class="mb-2"><a href="https://github.com/twbs/bootstrap">Bootstrap 5</a></li>
<li class="mb-2"><a href="https://github.com/twbs/bootstrap/tree/v4-dev">Bootstrap 4</a></li>
<li class="mb-2"><a href="https://github.com/twbs/icons">Icons</a></li>
<li class="mb-2"><a href="https://github.com/twbs/rfs">RFS</a></li>
<li class="mb-2"><a href="https://github.com/twbs/bootstrap-npm-starter">npm starter</a></li>
</ul>
</div>
<div class="col-6 col-lg-2 mb-3">
<h5>Community</h5>
<ul class="list-unstyled">
<li class="mb-2"><a href="https://github.com/twbs/bootstrap/issues">Issues</a></li>
<li class="mb-2"><a href="https://github.com/twbs/bootstrap/discussions">Discussions</a></li>
<li class="mb-2"><a href="https://github.com/sponsors/twbs">Corporate sponsors</a></li>
<li class="mb-2"><a href="https://opencollective.com/bootstrap">Open Collective</a></li>
<li class="mb-2"><a href="https://bootstrap-slack.herokuapp.com/">Slack</a></li>
<li class="mb-2"><a href="https://stackoverflow.com/questions/tagged/bootstrap-5">Stack Overflow</a></li>
</ul>
</div>
</div>
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