Applied Visual Design: Create Movement Using CSS Animation

Tell us what’s happening:

“The @keyframes rule for 100% should use the left offset of -25px.”

Why I’m getting this error ^ ?
Already set @keyframes 100% rule to left: - 25px.

Thank you!

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;
    top: 100px;
    left: -25px;    

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

Your browser information:

User Agent is: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:67.0) Gecko/20100101 Firefox/67.0.

Link to the challenge:


For @keyframes 100% need to change the value for the top property to 0px.

Why 0px and not -50px?