* {
  padding: 0;
  margin: 0;
}

html {
  background: url(http://space-wallpapers.net/images/wallpapers/hubble-ultra-deep-field_full.jpg) no-repeat center center fixed;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

canvas {
  background: "clear";
  /*url(http://cdn.theatlantic.com/static/infocus/hubble120112/h01_hs201229.jpg) no-repeat center center fixed;*/
  /*-webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;*/
  display: block;
  margin: 0 auto;
  padding: 100px 40px 100px 40px;
}