Stuck at at this HTML/CSS challenge

Tell us what’s happening:

Your code so far


<style>
div {
  height: 40px;
  width: 70%;
  background: black;
  margin: 50px auto;
  border-radius: 5px;
  position: relative;
  offsetX:  fixed;
}
#rect {
  animation-name: rainbow;
  animation-duration: 4s;
}

@keyframes rainbow {
  0% {
    top: 0px;
  }
  50% {
    top: 25px;
  }
  100% {
    top: -25px;
  }
}
</style>

<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/79.0.3945.130 Safari/537.36.

Challenge: Create Movement Using CSS Animation

Link to the challenge:
https://www.freecodecamp.org/learn/responsive-web-design/applied-visual-design/create-movement-using-css-animation

please tell us what’s happening

I have to 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.

This is m solution.

@keyframes rainbow {
0% {
top: 0px;
left: 0px;
}
50% {
top: 50px;
left: 25px
}
100% {
top: 0px;
left: -25px;
}