Reducing height of page title and changing some background colours

Hi How do I reduce the size of the title(selected portfolio)

https://www.augustineleudar.com/selected-portfolio-augustine-leudar/

also when I scroll down on here :

https://www.magikdoor.net/contact/

The navigation bar and the parts go white – where do I tell them to stay black or better still transparent with the light font ?
thanks

• This topic was modified 4 years, 1 month ago by Gusss.
• This topic was modified 4 years, 1 month ago by Gusss.
• This topic was modified 4 years, 1 month ago by Gusss.

The page I need help with: [log in to see the link]