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

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

.thumbnail span{ /*CSS for enlarged image*/
position: absolute;
background-color: #fff;
padding: 5px;
left: -1000px;
border: 1px solid 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: -500px;
left: 10px; /*position where enlarged image should offset horizontally */

}

/* FOTO a comparsa sinistra */

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

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

.thumbnail2 span{ /*CSS for enlarged image*/
position: absolute;
background-color: #fff;
padding: 5px;
left: -1000px;
border: 1px solid 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: -400px;
left: -350px; /*position where enlarged image should offset horizontally */

}


/* FOTO a comparsa destra orizzontali */



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

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

.thumbnail3 span{ /*CSS for enlarged image*/
position: absolute;
background-color: #fff;
padding: 5px;
left: -1000px;
border: 1px solid 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: -100px;
left: -50px; /*position where enlarged image should offset horizontally */

}

/* FOTO IN ALTO CENTRATA */



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

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

.thumbnail4 span{ /*CSS for enlarged image*/
position: absolute;
background-color: #fff;
padding: 5px;
left: -1000px;
border: 1px solid 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: -500px;
left: -100px; /*position where enlarged image should offset horizontally */

}