Tell us what’s happening:
**Your code so far**
<style>
:root {
--red-color: red;
}
.red-box {
background: var(red,--red-color);
height: 200px;
width:200px;
}
</style>
<div class="red-box"></div>
**Your browser information:**
User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.192 Safari/537.36.
Challenge: Improve Compatibility with Browser Fallbacks
Link to the challenge: