.swiper {
    width: 100%;
    height: 100%;
    background: #000;
}
.swiper-slide {
    color: #fff;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}
.parallax-bg {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    -webkit-background-size: cover;
    background-size: cover;
    background-position: bottom;
}
.parallax-bg::before{
    content: '';
    display: block;
    position: absolute;
    left: 0;
    top: 0px;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
}