Problem with background-color of cyan (solved)

Tell us what’s happening:
// running tests
The div element with class cyan should have a background-color of cyan.
// tests completed

Your code so far

body {
  background-color: #FFFFFF;

.green {
  background-color: hsl(120, 100%, 50%);

.cyan {
  background-color: hsl(180, 100%, 50%);

.blue {
  background-color: hsl(240, 100%, 50%);

div {
  display: inline-block;
  height: 100px;
  width: 100px;

<div class="green"></div>
<div class="cyan"></div>
<div class="blue"></div>

Your browser information:

User Agent is: Mozilla/5.0 (X11; Linux i686; rv:68.9) Gecko/20100101 Goanna/4.5 Firefox/68.9 PaleMoon/28.9.1.

Challenge: Adjust the Hue of a Color

Link to the challenge:

Are you using a browser extension that changes the colors of your pages? Those extensions interfere with the test suite.

The only browser extension I see installed is Video DownloadHelper.

I tried with SeaMonkey browser and I ran the test successfully. I don’t know if it had to do with extensions, but it seems possible it had to do with the browser. I mark your reply as the solution. Thank you.