How to make logo and nav menu side by side?

Hi, I’m trying to put the logo and the nav menu side by side; I did it (thanks to the forum), but now I have this situation: the menu is now aligned to the center of the logo, while I’d like it to be aligned to the bottom of the logo (and of course the background should adapt to it).
The website is not online yet, but you can see a screenshot here.
Thank you very much!