#index-bg, #index-slides, #index-overlay {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}

#index-bg {
    background: #ffffff;
    z-index: -3;
}

#index-slides {
    background-size: cover;
    background: url("/images/bg/bg_1.jpg") no-repeat center center;
    background-blend-mode: darken;
    transition: 3s;
    z-index: -2;
}

#index-overlay {
    background: url("/images/bg/main-overlay.png") no-repeat center center;
    z-index: -1;
}