3d box-ball animation

<div class="square">
  <div class="side side-1"></div>
  <div class="side side-2"></div>
  <div class="side side-3"></div>
  <div class="side side-4">
    <div class="shadow"></div>
  </div>
  <div class="side side-5"></div>
  <div class="side side-6"></div>
</div>
<div class="ball"></div>