Improve Compatibility with Browser Fallbacks (Stuck)

Hello guys! I’m stuck here, please

Your code so far


<style>
  :root {
    --red-color: red;
  }
  .red-box {
    
    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 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/responsive-web-design/basic-css/improve-compatibility-with-browser-fallbacks

what do you not understand? what have you tried? what do the failing tests say?

I have tried so many… but thanks anyway.

the correct thing to do is to simply add a RED background just above the first declaration.

background: red;