html, body {
    height: 100%;
  }
  
  body {
    background-image: radial-gradient(circle, #F0C505, #F76E2A 10%, #A71A5B 40%, #651366);
    position: relative;
    overflow: hidden;
  }
  
  canvas {
    display: block;
  }
  
  .call-to-action {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #FFF;
    cursor: pointer;
  }