.natural-gallery-js .figure {
    border-radius: 3px; /* and lots of other amazing stuff */
}

.natural-gallery-js .figure {border: 0px solid #222222; box-shadow: 0 5px 12px rgba(0, 0, 0, 0.5)}
.natural-gallery-js .figure:hover {border: 1px solid #222222;}

.natural-gallery-js .figure.zoomable:hover .image,
.natural-gallery-js .image.zoomable:hover {
    transform: rotate(0deg) scale(1.03);
}