christianrieger
Hi
It is by default set for transparent as the pallet will make it dark for all view with home page as well
add this code in custom css
#t4-header { background: #1d1f22;}
Also the Pallet not in used as u set the color of menu to white and dropdown bg also white.
The current behave of menu is normal but your site does not using masthead that load a background image for transparent background.
2 options : Add this code in custom css it will make all header black BG always.
Or you can add masthead on site so you will get same view as on the homepage.
