.img-thumbnail{position:relative;z-index:0}.img-thumbnail:hover{background-color:transparent;z-index:50}.img-thumbnail span{position:absolute;background-color:#ffffff;padding:5px;left:-1000px;border:1px solid #000;visibility:hidden;color:black;text-decoration:none}.img-thumbnail span img{border-width:0;padding:2px}.img-thumbnail:hover span{visibility:visible;top:-300px;left:-250px}