* { margin: 0; padding: 0; box-sizing: border-box; }
body { background: #000; overflow: hidden; width: 100vw; height: 100vh; }
#game-container { width: 100%; height: 100%; touch-action: none; }
canvas {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}