html {
    height: 100%;
    margin: 0;
    padding: 0;
}
body {
    margin: 0;
    width: 100vw;
    min-height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
#model3d {
    height: 400px;
    width: 400px;
}
@media (max-width: 500px) {
    #model3d {
        aspect-ratio: 1 / 1;
        width: 100%;
        height: auto;
    }
}