Running Test Freezes when triggered

Tell us what’s happening:
Basic HTML and HTML5: Create an Ordered List
It won’t either show an error message or show a correct message. It just keeps showing a running tests message.
I need the website tech support.

Your code so far

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

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0.

Link to the challenge:

Try clearing cache and see if that allows the tests to run to completion.

Try using Chrome…

And after that to get the test to pass, revisit the lesson…it’s asking for a background declaration

In this challenge you have to set background property to red and you set background-color property to red.

@Roma was correct to mention the use of chrome to do fcc challenges, also, @FatmaNagori also got it correct as the challenge asked u to use background and not background-color!