Problem with nav bar and footer

Hello all,

My navigation bar and footer are misplaced and sized wrong and i dont know how to solve this. They should both be centered and have 90% width but at the moment the navigation bar is 100% width and the footer looks really messed up on my iPhone 6s Plus in landscape. Its in the bottom right corner and there is only a quarter of the footer visible.

Does anybody know how to solve this?

I didn't find the right solution from the internet.
References:

https://forums.digitalpoint.com/threads/problem-with-nav-bar-and-footer.2818181/

website builder software