#product_viewer {
    text-align: center;
}
@media(min-width:768px) {
    #product_viewer .product-viewer__image {
        width: 90%;
        object-fit: contain;
        aspect-ratio: 2/.7;
    }
}
@media(max-width:768px) {
    #product_viewer .product-viewer__image {
        width: 100%;
    }
}