Improve Compatibility with Browser Fallbacks -thought I had the right solution but still got bug

Tell us what’s happening:
Although I’ve done what was requested, putting another background: red declaration, I still get an error msg.

Your code so far

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

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36.

Link to the challenge:

You did correctly add the background as instructed but for some reason you incorrectly add ‘red’ to the variable where it wasn’t called for.

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