What am i doing wrong here? Compatability with fall back challenge

**Im supposed to be adding another background declaration right before the existing declaration and set its value to red . i thought i did that below by adding
background: red

to my code…I’m not sure what i am missing

  **Your code so far**

<style>
:root {
  --red-color: red;
  
}
.red-box {
  background: red;
  --background: var(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) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36

Challenge: Improve Compatibility with Browser Fallbacks

Link to the challenge:

Hi @aang.joy20 !

Welcome to the forum!

The problem is here

You need to delete that.