html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}

canvas {
  position: fixed;
  width: 100%;
  height: 100%;
  z-index: -1;
}

#help {
  font-family: Helvetica, Arial, sans-serif;
  font-size: 10px;
  width: 100%;
  position:absolute;
  color: #fff;
  text-align: center;
  z-index: 0;
}