html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #191724;
    color: #f5f7fa;
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
}
#game-container {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}
canvas {
    display: block;
    width: 100%;
    height: 100%;
}