body {
    margin: 0;
    overflow: hidden;
  }

  button {
    position: absolute;
    top: 10px;
    left: 10px;
    padding: 10px;
    border-radius: 5px;
    background-color: #000000d3;
    color: #fff;
  }
  
  #canvas {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 999;
  }
  
  #instructions {
    width: 200px;
    padding: 10px;
    border: 1px solid #ccc;
    background-color: #f9f9f9;
  }
  
  #instructions h2 {
    margin-top: 200;
    font-size: small;
    font-family:'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
  }
  
  #instructions ul {
    list-style-type:none;
    margin: 200;
    padding: 0;
  }
  
  #instructions li {
    margin-bottom: 5px;
    font-size: small;
    font-family:'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
  }