Keyframes rule in CSS

how to change the keyframes rule to animation rainbow

Your code so far

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

#rect {
  animation-name: rainbow;
  animation-duration: 4s;
@keyframes rainbow
0% {
  background-color: blue;
50% {
  background-color: green;
100% {
  background-color: yellow;

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

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36.

Challenge: Learn How the CSS @keyframes and animation Properties Work

Link to the challenge:

Hi @noluthandolondiwe7,

You have a slight syntax error with your keyframes definition. Double check it against the example from the lesson to see if you can find it yourself.