.banner-slider{
    position: relative;
}
.banner-slider img{
    width: 100%;
    height: 100%;
}
.bn--slider .swiper-button{
    color: #686868;
    opacity: 0;
}
.bn--slider img {
    width: 100%;
    height: auto;
}
.bn--slider:hover .swiper-button{
    opacity: 1;
}