Problem related to fallback if the browser is not compatible with css

I dont’t know what mistake I am getting in in this code

  **Your code so far**

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

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0

Challenge: Improve Compatibility with Browser Fallbacks

Link to the challenge:

You added a comma in there. Get rid of it.

thanks a lot sir God bless you

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