Cubic Theme: Smaller Margin

Hi everyone,

I have created a gallery using the Cubic theme:
http://www.baybreezin.com/photography

I am using my posts as albums for the different categories of my photos. However, the margins of the post pages are so wide that the actual content area won’t even fit two photos beside each other, let alone 5 or 6 (see for example http://baybreezin.com/photography/uncategorized/on-the-road) . I would like the content area to be as wide as possible.

Can anyone help?
Thanks