#photo-viewer {
    position:relative;
    height: 500px;
    overflow: hidden;
}

#photo-viewer.is-loading:after{
    content: url(images/load.gif);
    position: absolute;
    top: 0;
    right: 0
}

#photo-viewer img {
    position: absolute;
    max-width: 100%;
    max-height: 100%;
    top: 50%;
    left: 50%;
}


#a.active {
    opacity: 0.3;
}