Default theme - How to remove space between header and body

Hi, 

I searched everywhere to remove the space between header and body.
I would like it to be right under the menu bar in all view.

When I get it in one view it does not work in the other (loggin / not loggin in) and when i get it (almost) in both I have a huge space in mobile view.
Is there a global setting i can put in custom css to have no space please?

Only in not mobile view, Moo mobile view is perfect i dont need to change anything about this.

Thank's for help