.nebu 
{
background-attachment: fixed; 
background-image: url(res/nebuback2.jpg); 
background-repeat: no-repeat; 
background-position: 56% 80%
} 

.sfumatura
{
background-image: url(res/sfuma.jpg); 
background-repeat: repeat-x; 
background-position: center top
} 

H1 {font-size:16px; font-family:Verdana; color:#291770;  font-weight:900; text-align:left}
H2 {font-size:10px; font-family:verdana; color:#291770; font-weight:100; text-align:center}
H3 {font-size:12px; font-family:verdana; color:black; font-weight:100; text-align:justify}
H4 {font-size:10px; font-family:verdana; color:#291770; font-weight:100; text-align:left}