Snake

<div></div>
<style>
  body {
    background: #c74e4e;
  }
  div {
    width: 20px;
    height: 20px;
    background: #ffffff;
    border-radius: 50px;
    position: absolute;
    top: 90px;
    left: 90px;
  }

  div::after {
    position: absolute;
    left: 100px;
    top: 0;
    background: #e0e246;
    content: '';
    height: 20px;
    width: 20px;
    border-radius: 5px;
    box-shadow:
      25px 0 #e0e246,
      50px 0 #e0e246,
      75px 0 #e0e246,
      100px 0 #e0e246,
      100px 25px #e0e246,
      100px 50px #e0e246,
      100px 75px #e0e246,
      100px 100px #e0e246,
      75px 100px #e0e246,
      50px 100px #e0e246,
      25px 100px #e0e246,
      0 100px #e0e246,
      -25px 100px #e0e246,
      -50px 100px #e0e246,
      -75px 100px #e0e246,
      -100px 100px #e0e246;
  }
</style>