Tell us what’s happening:
Your code so far
<style>
:root {
--red-color: red;
}
.red-box {
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 10.0; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0.
Link to the challenge:
https://learn.freecodecamp.org/responsive-web-design/basic-css/improve-compatibility-with-browser-fallbacks/