Animation code not working

Tell us what’s happening:

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 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36 OPR/68.0.3618.173.

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

Link to the challenge:

your code is correct just you misspelled keyframes with lowerCase k

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