body { margin: 0; }
canvas { width: 100%; height: 100% }

* {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
}

canvas {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
}