Can someone help me? i don't know what to do

Tell us what’s happening:

Your code so far

  :root {
    --red-color: red;
  .red-box {
    background: var(--red-color);
    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/71.0.3578.98 Safari/537.36.

Link to the challenge:

On the line above where the background value is set using a variable, set another background this time using the color keyword red as the value.

:root {
  --blue-color: blue;
.blue-box {
  /* Browser will set the background to blue */
  background: blue;
  /* If the browser does not understand variables it will keep the background color that was set above */
  background: var(--blue-color);