Pls help! me....... out pls

Tell us what’s happening:

Your code so far

:root {
  --red-color: red;
.red-box { 
  background: red; 
  background: var (--red-color);
      height: 200px;
<div class="red-box"

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:81.0) Gecko/20100101 Firefox/81.0.

Challenge: Improve Compatibility with Browser Fallbacks

Link to the challenge:

2 posts were merged into an existing topic: Pls i dont know what to do

Please do not create duplicate topics for the same challenge/project question(s). This duplicate topic has been unlisted.

Thank you.