html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
}

#gameCanvas {
  width: min(100vw, calc(100vh * 4 / 3));
  height: min(100vh, calc(100vw * 3 / 4));
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  border-radius: 1.2%;
}