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---
title: Improve Compatibility with Browser Fallbacks
---
## Improve Compatibility with Browser Fallbacks
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We need to add a fallback to the ```background``` property of the ```.black-box`` class.
### Example
```css
:root {
--black-color: black;
}
.black-box {
background: var(--black-color);
width: 100px;
height: 100px;
}
```
## Solution
Add a fallback to the ```background``` property before the existing background declaration:
```css
:root {
--black-color: black;
}
.black-box {
background: black;
background: var(--black-color);
width: 100px;
height: 100px;
}
```