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feat: Update contents

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Phuoc Nguyen
2023-08-19 19:27:15 +07:00
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---
category: Display
created: '2021-04-03'
description: Create a tree diagram with CSS
keywords: css sitemap, css tree diagram
thumbnail: /assets/css-layout/thumbnails/tree-diagram.png
title: Tree diagram
---
## HTML
```html
<div class="tree-diagram">
<ul>
<li>
<!-- Content -->
...
<!-- Sub items -->
<ul>
<li>
<!-- Content -->
...
<!-- Sub items -->
<ul>
<li>...</li>
<li>...</li>
...
</ul>
</li>
<li>...</li>
...
</ul>
</li>
<!-- Repeat other items -->
...
</ul>
</div>
```
## CSS
```css
.tree-diagram ul {
display: flex;
position: relative;
/* Reset */
list-style-type: none;
margin: 0;
padding: 1rem 0.5rem 0rem 0.5rem;
}
.tree-diagram ul ul::before {
border-right: 1px solid #d1d5db;
content: '';
/* Position */
position: absolute;
top: 0;
right: 50%;
/* Size */
height: 1rem;
width: 50%;
}
.tree-diagram li {
padding: 1rem 0.5rem 0rem 0.5rem;
position: relative;
/* Center the content */
align-items: center;
display: flex;
flex-direction: column;
}
.tree-diagram li::before {
border-right: 1px solid #d1d5db;
border-top: 1px solid #d1d5db;
content: '';
/* Position */
position: absolute;
top: 0;
right: 50%;
/* Size */
height: 1rem;
width: 50%;
}
.tree-diagram li::after {
border-top: 1px solid #d1d5db;
content: '';
/* Position */
position: absolute;
top: 0;
right: 0;
/* Size */
width: 50%;
}
.tree-diagram li:first-child::before,
.tree-diagram li:last-child::after {
/* Remove the top of border from the first and last items */
border-top: none;
}
/* Add a root item if you want */
li.tree-diagram__root::before {
border-right: none;
}
```
You can add a root item to the tree:
```html
<div class="tree-diagram">
<ul>
<li class="tree-diagram__root">...</li>
</ul>
</div>
```
<Playground>
```css placeholders.css hidden
.square {
background: #d1d5db;
height: var(--square-size);
width: var(--square-size);
}
.square--sm {
--square-size: 0.5rem;
}
.square--md {
--square-size: 2rem;
}
.square--lg {
--square-size: 4rem;
}
```
```css styles.css hidden
body {
align-items: center;
display: flex;
justify-content: center;
}
.tree-diagram ul {
display: flex;
position: relative;
/* Reset */
list-style-type: none;
margin: 0;
padding: 1rem 0.5rem 0rem 0.5rem;
}
.tree-diagram ul ul::before {
border-right: 1px solid #d1d5db;
content: '';
/* Position */
position: absolute;
top: 0;
right: 50%;
/* Size */
height: 1rem;
width: 50%;
}
.tree-diagram li {
padding: 1rem 0.5rem 0rem 0.5rem;
position: relative;
/* Center the content */
align-items: center;
display: flex;
flex-direction: column;
}
.tree-diagram li::before {
border-right: 1px solid #d1d5db;
border-top: 1px solid #d1d5db;
content: '';
/* Position */
position: absolute;
top: 0;
right: 50%;
/* Size */
height: 1rem;
width: 50%;
}
.tree-diagram li::after {
border-top: 1px solid #d1d5db;
content: '';
/* Position */
position: absolute;
top: 0;
right: 0;
/* Size */
width: 50%;
}
.tree-diagram li:first-child::before,
.tree-diagram li:last-child::after {
/* Remove the top of border from the first and last items */
border-top: none;
}
/* Add a root item if you want */
li.tree-diagram__root::before {
border-right: none;
}
```
```html index.html hidden
<div class="tree-diagram">
<ul>
<li class="tree-diagram__root">
<div class="square square--sm"></div>
<ul>
<li>
<div class="square square--sm"></div>
<ul>
<li>
<div class="square square--sm"></div>
</li>
</ul>
</li>
<li>
<div class="square square--sm"></div>
<ul>
<li>
<div class="square square--sm"></div>
</li>
<li>
<div class="square square--sm"></div>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
```
</Playground>