Moving the Right Column on Tumblr Just Plain Theme Options

[orienteering]

Hi there,

I am using the Just Plain Theme by Peter Vidani on Tumblr and am trying to emulate the design of a website I have already built independently using html/css. I've got most of what I want to do figured out, but what I can't figure out is how to move the #right id (body/posts) further right in this theme (it is currently floating I think). Any ideas on how I could move this further over?

For reference, here is the blog: http://redwingblackbirdtheater.tumblr.com/

And here is the website I am trying to mimic: http://blackbirdtheater.org/about/

Thanks!