33 lines
870 B
Markdown
33 lines
870 B
Markdown
---
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title: Constant width to height ratio
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tags: layout,beginner
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---
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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).
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- `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.
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- This method also allows content to be placed inside the element normally.
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```html
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<div class="constant-width-to-height-ratio"></div>
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```
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```css
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.constant-width-to-height-ratio {
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background: #333;
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width: 50%;
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}
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.constant-width-to-height-ratio:before {
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content: '';
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padding-top: 100%;
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float: left;
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}
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.constant-width-to-height-ratio:after {
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content: '';
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display: block;
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clear: both;
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}
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```
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