html { 
  background: url('./img/background.jpg') no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

#myCanvas {
  border: 1px solid #9C9898;
  padding: 0;
  margin: auto;
  display: block;
  width: 800px;
  position: relative;
}