Test broken: Learn how bezier curves work

My code is the same as the code in the video yet it is telling me it is wrong. Apparently it is affecting #ball2 when I haven’t touched any code related to #ball2.


    border-radius: 50%;
    background: linear-gradient(
    position: fixed;
    width: 50px;
    height: 50px;
    margin-top: 50px;
    animation-name: bounce;
    animation-duration: 2s;
    animation-iteration-count: infinite;
  #ball1 {
    left: 27%;
    animation-timing-function: cubic-bezier(.25, .25, .75, .75);

  #ball2 {
    left: 56%;
    animation-timing-function: ease-out;

  @keyframes bounce {
    0% {
      top: 0px;
    100% {
      top: 249px;


<div class="balls" id="ball1"></div>
<div class="balls" id="ball2"></div>

Hello Gareth.

I pasted your code into my browser, and the tests passed.

Generally, this is because of two reasons:

  1. Your browser/version is not compatible with the lesson.
  2. You have a browser extension that is preventing the tests from being run properly.

Solutions: Try a different browser (Chrome is recommended), and disable extensions until you find the culprit.

Hope this helps.