body {
  font-family: sans-serif;
  padding: 0;
  margin: 0;
  background-color: #121212;
  overflow: hidden;
  -webkit-user-select: none;
     -moz-user-select: none;
       -o-user-select: none;
      -ms-user-select: none;
          user-select: none;
}

canvas {
  position: absolute;
  top: 0;
  left: 0;
}