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96 lines
2.0 KiB
Plaintext
96 lines
2.0 KiB
Plaintext
---
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category: Display
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created: '2021-05-09'
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description: Create inverted corners with CSS
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keywords: css border radius, css inverted border radius, css inverted corners
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thumbnail: /assets/css-layout/thumbnails/inverted-corners.png
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title: Inverted corners
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---
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## HTML
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```html index.html
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<div class="inverted-corners">...</div>
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```
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## CSS
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```css styles.css
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:root {
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--inverted-corners-background: #d1d5db;
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--inverted-corners-size: 2rem;
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}
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.inverted-corners {
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background-color: var(--inverted-corners-background);
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/* Used to position the corner */
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position: relative;
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}
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.inverted-corners::before {
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content: '';
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/* Absolute position */
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bottom: calc(-2 * var(--inverted-corners-size));
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left: 0;
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position: absolute;
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/* Size */
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height: calc(2 * var(--inverted-corners-size));
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width: var(--inverted-corners-size);
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/* Border */
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background-color: transparent;
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border-top-left-radius: var(--inverted-corners-size);
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box-shadow: var(--inverted-corners-background) 0px calc(-1 * var(--inverted-corners-size)) 0px 0px;
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}
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```
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<Playground>
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```css styles.css hidden
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:root {
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--inverted-corners-background: #d1d5db;
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--inverted-corners-size: 2rem;
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}
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body {
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height: 24rem;
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}
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.inverted-corners {
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background-color: var(--inverted-corners-background);
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/* Used to position the corner */
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position: relative;
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/* Demo */
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height: 2rem;
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width: 100%;
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}
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.inverted-corners::before {
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content: '';
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/* Absolute position */
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bottom: calc(-2 * var(--inverted-corners-size));
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left: 0;
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position: absolute;
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/* Size */
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height: calc(2 * var(--inverted-corners-size));
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width: var(--inverted-corners-size);
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/* Border */
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background-color: transparent;
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border-top-left-radius: var(--inverted-corners-size);
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box-shadow: var(--inverted-corners-background) 0px calc(-1 * var(--inverted-corners-size)) 0px 0px;
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}
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```
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```html index.html hidden
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<div class="inverted-corners">
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</div>
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```
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</Playground>
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