html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #0b1b1b;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
}

#GameFrame {
  display: block;
  flex: 0 0 auto;
  width: min(100vw, 46.127vh);
  width: min(100vw, 46.127dvh);
  height: 100vh;
  height: 100dvh;
  border: 0;
  background: #0b1b1b;
}

@media (orientation: portrait) and (max-width: 800px) {
  #GameFrame {
    width: 100vw;
  }
}