Altering Pinboard Theme

Hi,

I am working on this site: http://www.completeequestrian.com.au/

which is using this theme: http://ww.wp.xz.cn/themes/pinboard

I want to have the banner under the menu flush with the 4 images underneath it. But I can’t seem to figure it out. The images seem to have a height and width that aren’t being effected by CSS…

<div class=​"column fourcol">​

The above code is offended to my mind but I can’t get it to change.

Please help!