#game{display:block;width:100%;height:100%;border:0}#stage{aspect-ratio:854/480}#stage:fullscreen #game{width:100vw;height:100vh}@media(max-width:640px){#stage{height:auto;min-height:0;max-height:none;aspect-ratio:854/480}}

#stage:fullscreen{height:100vh;width:100vw;min-height:0;max-height:none;aspect-ratio:auto}