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

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

.thumbnail span{ /*CSS for enlarged image*/
position: absolute;
background-color: lightyellow;
padding: 5px;
left: -900px;
top:10px;
border: 1px dashed gray;
visibility: hidden;
color: black;
text-decoration: none;
}

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

.thumbnail:hover span{ /*CSS for enlarged image on hover*/
visibility: visible;
top: 380;
left: 1px; /*position where enlarged image should offset horizontally */

}
.thumbnail2{
position: relative;
z-index: 0;
}

.thumbnail2:hover{
background-color: transparent;
z-index: 50;
}

.thumbnail2 span{ /*CSS for enlarged image*/
position: absolute;
background-color: lightyellow;
padding: 5px;
left: -900px;
top:10px;
border: 1px dashed gray;
visibility: hidden;
color: black;
text-decoration: none;
}

.thumbnail2 span img{ /*CSS for enlarged image*/
border-width: 0;
padding: 2px;
}

.thumbnail2:hover span{ /*CSS for enlarged image on hover*/
visibility: visible;
top: 380;
left: 1px; /*position where enlarged image should offset horizontally */

}
.thumbnail3{
position: relative;
z-index: 0;
}

.thumbnail3:hover{
background-color: transparent;
z-index: 50;
}

.thumbnail3 span{ /*CSS for enlarged image*/
position: absolute;
background-color: lightyellow;
padding: 5px;
left: -900px;
top:10px;
border: 1px dashed gray;
visibility: hidden;
color: black;
text-decoration: none;
}

.thumbnail3 span img{ /*CSS for enlarged image*/
border-width: 0;
padding: 2px;
}

.thumbnail3:hover span{ /*CSS for enlarged image on hover*/
visibility: visible;
top: 380;
left: 1px; /*position where enlarged image should offset horizontally */

}
.thumbnail4{
position: relative;
z-index: 0;
}

.thumbnail4:hover{
background-color: transparent;
z-index: 50;
}

.thumbnail4 span{ /*CSS for enlarged image*/
position: absolute;
background-color: lightyellow;
padding: 5px;
left: -900px;
top:10px;
border: 1px dashed gray;
visibility: hidden;
color: black;
text-decoration: none;
}

.thumbnail4 span img{ /*CSS for enlarged image*/
border-width: 0;
padding: 2px;
}

.thumbnail4:hover span{ /*CSS for enlarged image on hover*/
visibility: visible;
top: 380;
left: 1px; /*position where enlarged image should offset horizontally */

}