body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #333;
}

#gameContainer {
    width: 1000px;
    height: 800px;
    border: 0px solid #fff;
}

canvas {
    display: block;
    margin: 0 auto;
    background-color: #000;
}