body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: #000;
    font-family: system-ui, -apple-system, sans-serif;
    user-select: none;
}

#game-viewport {
    width: 100%;
    height: 100%;
    display: block;
}