Reduce header space between logo and main menu

Hello, I was wondering how I could reduce the space between the logo and the menu, but not the top of the logo nor the bottom of the menu? (and if the menu is shorter and the logo is aligned on the same row horizontally, it wouldn't be affected by the reduced space when they are on 2 rows). I am using catch kathmandu free theme. Thank you. The website is located here: http://coop.flagshop.com/ Thank you.