Gap between header submenu and menu

Hi, I reduced the height of my menu. As a consequence, there is a gap between the menu and the submenu. I searched the forum for this issue and I couldn't find a css line that would fix it. Help? The problem will become clear when you try to hover over the menu. This is my website: http://f35.7f7.myftpupload.com/ Many, many thanks in advance, Caroline