Center title/navigation, Page title background margin/color, remove author

Hi there, i would appreciate some more help with my website: https://eugenfloethmann.de/ 1. How to center Logo/Tite an navigation menu. Everything above slilder 2. On all other pages i need to change the height and color of grey background behind page titles 3. How can i remove the line "BY DRESSEL" above posts and "prev post"/"next post" section below? ( https://eugenfloethmann.de/featured-content/das-buch-zum-thema/ ) 4. Also i need to remove height of my footer widget. (Impressum) Thanks so much for help, Tobi