html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
}

html,
body {
  overflow: hidden;
  background: #000;
}

body {
  display: grid;
  place-items: center;
  touch-action: none;
}

#player,
ruffle-player {
  display: block;
}

#player {
  width: min(100vw, calc(100vh * 4 / 3));
  height: min(100vh, calc(100vw * 3 / 4));
  aspect-ratio: 4 / 3;
}

ruffle-player {
  width: 100%;
  height: 100%;
}