Hello,
1) To get transparent try to add this code into custom.css file:
.header6 .logo img{
opacity:0.8;
}
2) To change the background color of the navigation use following code:
.main-nav{
background: red;
}
and fixed header
.fixed-header{
background: red;
}
3) Could you please clarify with more details what exactly you want to do and show us screenshots?
Regards,
Robert Hall.