#overlay-ui {
    position: absolute;
    top: 0px;
    left: 0px;
    right: 0px;
    bottom: 0px;
}

.overlay-container {
    position: absolute;
    top: 0px;
    left: 0px;
    right: 0px;
    bottom: 0px;
    overflow: hidden;
}

#background, .background-image, .background-cover {
    width: 100%;
    height: 100%;
    position: absolute;
}