html {
  height: 100%;
  overflow: hidden;
  content-zooming: none;
  transform: scale(0.9);
}

body {
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
}

canvas {
  display: block;
}