#group {width:770px; 
margin-right: auto;
margin-left: auto;}

#group1 {width:637px; 
margin-right: auto;
margin-left: auto;}

#group2 {width:px;   
margin-right: auto;
margin-left: auto;}

#group3 {width:px;   
margin-right: auto;
margin-left: auto;}

#group4 {width:px;   
margin-right: auto;
margin-left: auto;}