Reduce spacing between logo and menu etc.

Please forgive me if this has been discussed and answered before...I am completely new to not only wordpress but simple catch as well. Yesterday I replaced all things default; logo, site title and tag line at the header at exposeasign.com My question is; how can I decrease the spacing between my logo (which is slightly larger in height than the default logo) so that the distance between my menu bar/search box/facebook and google+ buttons look similar to when it did when I first installed the theme. Maybe its just me being picky, but I feel that the blank area is too much and really liked the look of the default theme. If possible I'd like to keep my logo the same height so that it remains legible. My coding is not very good so if there is some real beginner types instructions/steps I'd appreciate it greatly...I do know where to find the css :)