Drop Down Menu

After centering my menu in my child theme using steps here, the hover size changed to not cover the entire menu height. My website is tmdexterphotography.com/ . This black gap that appears below the link in the menu also interferes with the drop down menu. Changing menu height to original 30px still leaves a black gap below the word and begins to cut it off. Any idea what part of the menu code to work with to fix this? I am also using gecka submenu. Thanks!