Where is the mistike?

Tell us what’s happening:

  solution is not working :(

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;
    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; rv:86.0) Gecko/20100101 Firefox/86.0.

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

Link to the challenge:

You have syntax errors. Look at your opening and closing brackets {} make sure they match and you do not have any extras.

You can look at the example code given for some syntax guidance.

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