* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background: #1a1a1a;
  color: #fff;
  font-family: "Hiragino Maru Gothic ProN", "ヒラギノ丸ゴ ProN W4", "Hiragino Sans", sans-serif;
  overflow: hidden;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
  height: 100vh;
}
#game-container {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}
canvas {
  max-width: 100% !important;
  max-height: 100% !important;
  image-rendering: auto;
}