1. Reduced CSS by deleting unnecessary attributes
2. Added all li elements to the class 'left'
3. Implemented naviWrapper: Keeps the navi always centered on large screens + max-width
4. Removed margin from the nav elements (both left and right). They're now getting clipped
by the naviWrapper
5. Added 'Freunde Teltow' aside of the header logo
6. Replaced the button class with an 'abstrakt' class to inherit default button attributes
7. To use custom buttons use now one of the button extension classes: bDefault, bTransparent
8. Applied a darker background color for the header #343434 : #242424