.swiper-thumbs .swiper-slide {
    padding: 3px;
}

.swiper-thumbs .swiper-slide img {
    box-shadow: 0px 0px 0px 2px #000;
    transition: box-shadow .6s cubic-bezier(.075,.82,.165,1);
}

.swiper-thumbs .swiper-slide img:hover {
    box-shadow: 0px 0px 0px 2px #fff;
}

.swiper-thumbs .swiper-slide.swiper-slide-thumb-active img {
    box-shadow: 0px 0px 0px 2px #000, 0px 0px 0px 3px #fff;
}