Tell us what’s happening:
Describe your issue in detail here.
**Your code so far**
<style>
:root {
--red-color: red;
}
.red-box {
background: red ; /* this is the browser fallback */
background: var(--red-color);
height: 200px;
width:200px;
}
</style>
<div class="red-box"></div>
**Your browser information:**
User Agent is: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36 Edg/91.0.864.70
Challenge: Improve Compatibility with Browser Fallbacks
Link to the challenge: