How do I include a fallback with the background set to red right after the existing background

Tell us what’s happening:
Describe your issue in detail here.

   **Your code so far**

 :root {
   --red-color: red;
 .red-box {
   background: var(--red-color);
   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) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.54 Safari/537.36

Challenge: Improve Compatibility with Browser Fallbacks

Link to the challenge:

the fallback is for browsers that are not able to read variables, so you need to change the first of these two to set the background to red without using a variable, but just a color

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