* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #222;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

#gameContainer {
    width: 90%;
    max-width: 1280px;
}

#gameContainer:fullscreen {
    width: 100%;
    max-width: none;
}

#gameCanvas {
    width: 100%;
    height: auto;
    display: block;
    aspect-ratio: 16 / 9; /* 1280 / 720 */
    background-color: #000;
}