Having problem with Fallbacks

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 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36.

Link to the challenge:

In the empty line under .red-box,

you want to have a fallback there.

Simply give your background color red there.

I had same problem…
.red-box {
background: red;


@Kate4 Hi there.

You need to use both the background declaration red and the variable declaration, hope this helps.