#game-stage {
  position: fixed;
  inset: 0;
  display: none;
  line-height: 0;
  background: #060608;
}

#game-stage:not([hidden]) {
  display: flex;
  align-items: center;
  justify-content: center;
}

#game-stage canvas {
  display: block;
  width: 100vw;
  height: 100vh;
  object-fit: contain;
}