What did I miss

Tell us what’s happening:

.red-box {

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

background: var(--red-color);

height: 200px;

width:200px;

}
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 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36.

Challenge: Improve Compatibility with Browser Fallbacks

Link to the challenge:

just removing the comment for me it passes

Thanks it works now.