html,body{margin:0;width:100%;height:100%;overflow:hidden;background:#111;font-family:Arial,sans-serif;touch-action:none}
body{display:flex;align-items:center;justify-content:center}
#stage{width:100vw;height:100vh;display:flex;align-items:center;justify-content:center;overflow:hidden}
canvas{display:block;width:min(100vw,calc(100vh * 4 / 3));height:min(100vh,calc(100vw * 3 / 4));max-width:100%;max-height:100%;aspect-ratio:4/3;background:#fff;box-shadow:0 0 24px #0008;touch-action:none;user-select:none;-webkit-user-select:none}