Why isn't this the red background being declared before the variance?

Tell us what’s happening:

Your code so far

  :root {
    --red-color: red;
  .red-box {
    background: var(--red-color, red);
    height: 200px;
<div class="red-box"></div>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36.

Link to the challenge:

Delete ‘, red’ from var (…)
And add background: red ; in the empty line below .red-box.

thank you!!! this helped me so much, i was stuck on this problem for a while. thank you so much.

You are welcome Camper