Bootstrap browser width / full screen

[ce7]

hi

I have phoenix 1075, when full screen, the navbar works greate

however, if i make the the browser smaller size, this is what it looks like

so the navbar height will be increased and cover the store logo area, how can i modify (which file) code, to make the header / store logo area not be covered by the navbar?

any help or suggestion is appreciated, thanks!  Lyn