html, body {
    height: 100%;
    margin: 0;
  }
  #c {
    width: 100%;
    height: 100%;
    display: block;
  }
  #info {
    position: absolute;
    left: 1em;
    top: 1em;
    background: rgba(57, 49, 167, 0.8);
    padding: .5em;
    color: rgb(27, 197, 27);
    font-family: monospace;
  }