Dont understand the assignment

Tell us what’s happening:
so the assignment is:
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.
and i dont understand what im supposed to do… so if anyone could explain it that would mean a lot to me…

  **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 (X11; CrOS x86_64 14092.46.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.69 Safari/537.36

Challenge: Create Movement Using CSS Animation

Link to the challenge:

ok i got it i just had to add left and then how much i needed to move…

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