.header {
    padding: 40px;
}

.header-navbar {

}

.header>.slider {
    position: absolute;
    width: 100vw;
    height: 840px;
    overflow: hidden;
    top: 0;
    left: 0;
    z-index: -1;
}

.header>.slider>.slider-item {
    position: absolute;
    width: 100vw;
    object-fit: cover;
}