How to fix navigation to not colapse

Hallo there guys,

I have this one question, how do I get my navigation to not break down in two rows when the browser window gets to small.

I`ve tried with min-width and a fixed height, but I just cannot seem to fix it. Can you please give me some tips?
I have in generall problems with controlling my graphical elements within browsers of different sizes... what is the rule there?


and here`s the site:

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