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

#canvas {
  display: block;
  overflow: hidden;
  background: #262626;  
  background-image: url('img/nebula2.jpg');
  background-repeat: repeat;
  position: fixed;
  width: 100vw;
  height: 100vh;
}