#gallery {
    display: block;
}
#product_gallery {
    display: flex;
    left: 0;
    margin: auto;
    right: 0;
    width: 100%;
}
#product_gallery .gallery {
    display: block;
}
#product_gallery .gallery .s_thumb.image_small img {
    display: inline-flex;
    width: 99%;
}
#product_gallery .gallery li {
    display: inline-block;
    max-width: 19%;
}