body, html{
  background-color: #222;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

canvas {
  margin: auto;
  position :absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  
  image-rendering: pixelated;
  image-rendering: optimizeSpeed;
  image-rendering: -moz-crisp-edges;
  image-rendering: -webkit-optimize-contrast;
  image-rendering: optimize-contrast;
}