GoPress – How to delete white space in menu

Hello,

I have a small problem with style.php. I delete the space beetwen header (logo) and menu by change margin header on 0. But now if u clik for example on Sample Page you have white space beetwen menu buton (sample page) and categories.
1) How to delete this free space?
2) How to change blue line for another color?
3) How to distibute menu buttons on the whole widht of the page?

Thanks in advace

link: https://www.routeofdreams.com