Improve Compatibility with Browser Fallbackss

Tell us what’s happening:
I added what i think would be the immediate fall back which is background: red;

Your code so far

  :root {
  .red-box {
    background: red;
    background-color: red;
    background: var(--red-color,red);
    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/71.0.3578.80 Safari/537.36.

Link to the challenge:

If you are having issues with is one, you only needed to declare the background once. Remove the fallback on the existing background and the background-color and you should pass