.swiper-3d .swiper-slide-shadow-right {
    background-image: linear-gradient(to right,rgba(0,0,0,.1),rgba(0,0,0,0));
}

.swiper-3d .swiper-slide-shadow-left {
    background-image: linear-gradient(to left,rgba(0,0,0,.1),rgba(0,0,0,0));
}