I really like my tumblr theme and would really like to have my store integrated within my tumblr. The thing is, my tumblr has a 3-column theme and when I integrate my store, it takes on the same dimensions as the post dimensions. My tumblr URL is http://shopshorts.tumblr.com
and as you can see, I've customized it so that each post is only half-ish the width of the page. Is there any way I can change the width of my store page (essentially changing the width of the posts only on the store page) while keeping the same theme?
Thanks in advance!