body {
    margin: 0;
    background-color: black;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

#gameCanvas {
    display: block;
    background-color: #222;
    image-rendering: pixelated;
    width: 800px;
    height: 600px;
    border: 2px solid #fff;
}