div.image-slider img:not(:first-child){ display: none; }
div.image-slider div.thumbnails a { width: 80px; height: 80px; display: inline-block; background-size: contain; background-position: center center; background-repeat: no-repeat; border: 1px solid #cccccc;}
div.image-slider div.thumbnails a:not(:first-child) { margin-left: 10px; }