35 lines
888 B
Markdown
35 lines
888 B
Markdown
---
|
|
title: Constant width to height ratio
|
|
tags: layout,beginner
|
|
---
|
|
|
|
Given an element of variable width, it will ensure its `height` remains proportionate in a responsive fashion (i.e. its `width` to `height` ratio remains constant).
|
|
|
|
```html
|
|
<div class="constant-width-to-height-ratio"></div>
|
|
```
|
|
|
|
```css
|
|
.constant-width-to-height-ratio {
|
|
background: #333;
|
|
width: 50%;
|
|
}
|
|
|
|
.constant-width-to-height-ratio:before {
|
|
content: '';
|
|
padding-top: 100%;
|
|
float: left;
|
|
}
|
|
|
|
.constant-width-to-height-ratio:after {
|
|
content: '';
|
|
display: block;
|
|
clear: both;
|
|
}
|
|
```
|
|
|
|
#### Explanation
|
|
|
|
- `padding-top` on the `:before` pseudo-element causes the height of the element to equal a percentage of its width. `100%` therefore means the element's height will always be `100%` of the width, creating a responsive square.
|
|
- This method also allows content to be placed inside the element normally.
|