body {
  margin: 0px;
  height: 100%;
  overflow: hidden;
  background: -moz-radial-gradient(center, ellipse cover, #ffc578 0%, #fb9d23 100%);
  background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, #ffc578), color-stop(100%, #fb9d23));
  background: -webkit-radial-gradient(center, ellipse cover, #ffc578 0%, #fb9d23 100%);
  background: -o-radial-gradient(center, ellipse cover, #ffc578 0%, #fb9d23 100%);
  background: -ms-radial-gradient(center, ellipse cover, #ffc578 0%, #fb9d23 100%);
  background: radial-gradient(ellipse at center, #ffc578 0%, #fb9d23 100%);
}

canvas {
  height: 100%;
}