Menu bar background color

Dear Support Team,

I have two questions regarding to menu bar on Boldial Theme.

First:
I want to have a homepage like in the example below;
https://www.mobiles.co.uk/smart-phone-dumb-users/

Second:

When users register and login they should be having a menu bar as in the example below;
https://themes.ishyoboy.com/?theme=no8-wp

So the menu background must match with the website background image all the time even if the user scroll down.

Thanks in advance.
Burak