html, body{height:100%;} 




.visibile_mozz{

position:absolute; 
/*
width:800px;
height:600px;
*/
z-index:500;
 
left: 50%;
margin-left:-400;
top: 50%;
margin-top:-350;

/*visibility:visible*/
display:inline



}
.visibile_exp{

position:absolute; 
width:800px;
height:600px;
z-index:5; 
left: 50%;
margin-left:-400;
top: 50%;
margin-top:-350;
/*visibility:visible*/
display:inline



}




.dettaglio_visibile_mozz{

position:absolute; 
width:700px;
height:680px;
z-index:500;
left: 50%;
margin-left:-350;

visibility:visible





}
.dettaglio_visibile_exp{



position:absolute; 
width:700px;
height:680px;
z-index:500; 
left: 50%;
margin-left:-350;

display:inline



}