Fullwidth Submenu Custom Changes

Hello!

I’ve got some problems/ wishes with the fullwidth submenu, could you please have a look at it? Currently I’m testing in “Tischtennis”, so every problem I have is only visible in the submenu of “Tischtennis”.

1. There is a white background (or every other color I adjust in the alternate content background color) with every fullwidth submenu’s item – I’d like to have it transparent like it is in the main menu but I don’t know how to address these elements correctly.

2. Is there any possibility to have two fixed positions for the fullwidth submenu? One with full-sized header and one with scrolled header. At the moment there is the issue that at some point when you scroll down the submenu is overlapping the main-menu until the header shrinks and the main-menu “jumps” up.

3. There’s this yellow line a bit underneath the submenu I’d like the disappear. How can I manage that without losing the one next to the left sidebar?

4. I’d love to have no submenu on hover when there is a avia fullwidth submenu – I suspect that this isn’t possible without further ado but I thought I’d ask nevertheless. Is there any (easy) possibility you can tell me?

Thank you very much in advance!
Regards,
Lucas