Make Motion More Natural Using a Bezier Curve issue

Tell us what’s happening:

What’s the issue in this code, could not find it.

Your code so far

  .balls {
    border-radius: 50%;
    position: fixed;  
    width: 50px;
    height: 50px;
    top: 60%;
    animation-name: jump;
    animation-duration: 2s;
    animation-iteration-count: infinite;
  #red {
    background: red;
    left: 25%;
    animation-timing-function: linear;
  #blue {
    background: blue;
    left: 50%;
    animation-timing-function: ease-out;
  #green {
    background: green;
    left: 75%;

  @keyframes jump {
    50% {
      top: 10%;
<div class="balls" id="red"></div>
<div class="balls" id="blue"></div>
<div class="balls" id="green"></div>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.0 Safari/537.36.

Link to the challenge:

The y1 value is 0.441, not 0.411


Should be: