Full width posts/pages

Hi, http://www.cornerspeedphoto.com/ I'm wondering if it's possible to have posts/pages display wider horizontally? I'm using the single column template on the pages, but would prefer the actual body of the page/post to be wider. Also, on the homepage slider the left/right nav buttons clip into the slide counter, rendering the right nav button inoperable. Can these 2 buttons be pushed further left to avoid this happening? Many thanks for this wonderful template!