body {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  overflow: hidden;
}

#container {
    position: absolute;
    width: 100vmax;
    height: 100vmax;
    left: 50%;
    top: 50%;
    background: linear-gradient(to bottom, #98c7dd, #0ea7f2);
    transform: translate3d(-50%, -40%, 0);
}

canvas {
  display: block;
}