.slick-prev:before, .slick-next:before{
    color: #EE6B7F;
    font-size: 30px;
    opacity: 0;
    transition: 0.3s;
}
.slick-prev{
    left: 25px;
    z-index: 999;
}
.slick-next{
    right: 25px;
}
.gallery:hover .slick-prev:before, .gallery:hover .slick-next:before{
    opacity: .9;
}