Fixed width

Hi Everyone!

I’m using Delicate theme for my website (very good theme I must say) but I can’t figure out how to give my pages a minimum fixed width. Currently, when you browse the website with a certain screen resolution, the menu and all the elements of the pages are wrapped, I mean each of the element menu is displayed above the other. I’d rather prefer that, under a certain resolution, the horizontal scroll bars appear. I find it better than having the pages distorted.
Does anyone have any solution ?

Thanks a lot!!