.thumbnail{
position: relative;
z-index: 0;
}

.thumbnail:hover{
background-color: transparent;
z-index: 50;
}

.thumbnail span{ /* CSS for displayed image */
position: absolute;
background-color: transparent;
padding: 5px;
left: -1000px;
border: none;
visibility: hidden;
color: gray;
text-decoration: none;
}

.thumbnail span img{ /* CSS for displayed image */
border-width: 0;
padding: 2px;
}

.thumbnail:hover span{ /* CSS for displayed image on hover */
visibility: visible;
top: -90;
left: 430px; /* horizontal offset for displayed image */

}

</style>