body {
    margin: 0;
    display: block;
    width: 100vw;
    height: 100vh;
    background-color: #181818;
}
canvas {
    position: absolute;
    aspect-ratio: 4/3;
}
@media (min-aspect-ratio: 4/3) {
    canvas{
        height: 100%;
        left: 50%;
        transform: translate(-50%, 0%);
    }
}
@media not (min-aspect-ratio: 4/3) {
    canvas {
        width: 100%;
        top: 50%;
        transform: translate(0%, -50%);
    }
}