body, html{
    background-color: #222;
    width: 100%;
    height: 100%;
    overflow: hidden;
  }
  
  canvas {
    display: block;
    margin: auto;
    position :absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    
    image-rendering: optimizeSpeed;
    image-rendering: -moz-crisp-edges;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: optimize-contrast
  }