body {
    position: relative;
    overflow: hidden;
    margin: 0;
    width: 100vw;
    height: 100vh;
}

.content-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
.content-container__item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    object-fit: cover;
}
.content-container__item_video {}
.content-container__item_image {}
.content-container__item_active_prev {
    z-index: 2;
}
.content-container__item_active {
    z-index: 3;
    animation: fadeIn .5s forwards;
}
