Create Movement Using CSS Animation : Applied Visual Design

Tell us what’s happening:

Your code so far

  div {
    height: 40px;
    width: 70%;
    background: black;
    margin: 50px auto;
    border-radius: 5px;
    position: relative;

#rect {
  animation-name: rainbow;
  animation-duration: 4s;

@keyframes rainbow {
  0% {
    background-color: blue;
    top: 0px;
    left: 0px;
  50% {
    background-color: green;
    top: 50px;
    left: 25px;
  100% {
    background-color: yellow;

<div id="rect"></div>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36.

Link to the challenge:

It looks like you modified the top property at 100% in the rainbows keyframe. This wasn’t needed. You did the left properties correctly as indicated in the instructions.

The 100% keyframe rule should have the top property set like this:

top: 0px;

Does this help you to pass the tests?

But why 0px and not -50px?