#gallery .tile .caption{height:100%;-webkit-transition:opacity .3s;-moz-transition:opacity .3s;-o-transition:opacity .3s;transition:opacity .3s;position:absolute;opacity:0;top:0;background:rgba(0,0,0,.4);left:0;width:100%;display:block}#gallery .tile:hover .caption{opacity:1}#gallery .tile:hover{cursor:pointer}