Wow, looks good now. Thanks alot! Can you tell me, where the problem was?
There are 2 more issues, I couldn't solve: 
Mobile/Burger Icon. It's set right, but it hangs around somewhere in the lower right side of the header.
I tried to center it horizontally and (really) right side, but that didn't work.
Second: my navigation is a bit long and the last point jumps into a second row.
In order to fix that, the mobile icon must show up already in smaller desktops (lower than 1540).
How can I get there?
Can we discuss that here, or shall I open 2 new posts?