I think i did all what is asked, but still not sure why my code not passing

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;
  50% {
    background-color: green;
    top: 50px;
  100% {
    background-color: yellow;
    top: 0px;

<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/58.0.3029.110 Safari/537.36 Edge/16.16299.

Link to the challenge:

Take a closer look at the instructions.

Add a horizontal motion to the div animation. Using the left offset property, add to the @keyframes rule so rainbow starts at 0 pixels at 0%, moves to 25 pixels at 50%, and ends at -25 pixels at 100%. Don’t replace the top property in the editor - the animation should have both vertical and horizontal motion.

at 50% it should move 25px and 100% -25px.

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