I did what it said but I can't pass the challenge I don't know what to do with it

Tell us what’s happening:
Hi everybody,
Is anyone out there to help with this challenge, I don’t know what is wrong with this.

Your code so far

:root {
  --red-color: red;
.red-box {
  Background: red; /* this is the browser fallback */
  background: var(--red-color);
  height: 200px;
<div class="red-box"></div>

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.2 Safari/605.1.15.

Challenge: Improve Compatibility with Browser Fallbacks

Link to the challenge:

Hello there,

Watch out for typos…the line below yours:

background: var(--red-color);

What you added:

Background: red; /* this is the browser fallback */

Also, your comment is going to mess with the tests.

Hope this helps