body {
    margin: 0;
    background-color: #222;
}
#container {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    height:100vh;
}
canvas {
    width: 496px;
    height: 512px;
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
}