Free space after gallery

Hello,

today I used the gallery feature for the first time. It’s very nice, but I’ve a CSS problem with it. After the gallery there is very much space and I’ve no idea why. See this: http://www.funnydingo.de/blog/2009/05/22/windows-7-langsamer-bei-hdd-burstrate/

Any idea how to modify the CSS?

TIA,
Funny