html, body {
  margin: 0;
  height: 100%;
  background: #0f0d1a;
  display: grid;
  place-items: center;
}

#game {
  max-width: 100vw;
  max-height: 100vh;
  border-radius: 12px;
  touch-action: none;
  cursor: crosshair;
}