* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background: #0a0010;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
    touch-action: none;
    user-select: none;
}
#game-canvas {
    width: min(100%, calc(100vh * 16 / 9));
    height: auto;
    display: block;
    cursor: none;
}