header {
    position: relative;
    width: 100%;
    min-height: 75vh;
}

header .swiper {
    position: absolute;
    width: 100%;
    height: 75vh;
    top: 0;
    z-index: 0;
}

header .swiper img {
    width: 100%;
    object-fit: cover;
    height: 100%;
}