Animation test

<style>
  .test{
    height:100px;
    width:100px;
    background:red;
    animation:colour-change 1s infinite;
  }
  @keyframes colour-change {
    0%{background:red;}
    33.33%{background:green}
    66.66%{background:yellow}
    100%{background:blue}
  }
</style>
<div class="test">
</div>