Improve Compatibility with Browser Fallbacks please help

Tell us what’s happening:
how can i write this down . the fall back background color to make it red. it still refuses to work

Your code so far


<style>
  :root {
    --red-color: red;
  }
  

  .red-box {
    background:red;
    background: var(--red-skin);
    height: 200px;
    width:200px;

  }
</style>
<div class="red-box"></div>

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

You misspelled the variable name, it’s not --red-skin.

ooooh thanks so much