.thumbnail{
position: relative;

}

.thumbnail:hover{
background-color: transparent;
z-index: 4500;
}

.thumbnail span{ /*CSS for enlarged image*/
position: absolute;
background-color: #bdbdbd;
padding: 5px;
left: -1000px;
border: 0px dashed gray;
visibility: hidden;
color: black;
text-decoration: none;

}

.thumbnail span img{ /*CSS for enlarged image*/
border-width: 0;
padding: 0px;

}

.thumbnail:hover span{ /*CSS for enlarged image on hover*/

visibility: visible;
left: 50px; /*position where enlarged image should offset horizontally */
z-index: 4000;

}