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

HTML-CSS
1

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

  **Your code so far**


<style>
:root {
  --red-color: red;
}
.red-box {
  background:red;
  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; rv:91.0) Gecko/20100101 Firefox/91.0

Challenge: Improve Compatibility with Browser Fallbacks

Link to the challenge:

2

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

3

thanks a lot sir God bless you

4

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