Unwind theme – Attachment page full width issue

Hi,

I’m using the Unwind theme, and my main page/blog post is set to full-width and works correctly! However, when I click on a image in a bloh post and get taken to an “attachment page”, the image appears to be thumbnail and all the sidebars appear. I have disabled all sidebars in my settings, set the page template to “No sidebars” and also tried “Full Width, no sidebars”, but they don’t seem to work. Help?! Is there a CSS rule I can use? I don’t want any sidebars to appear, and I want the thumbnails to be larger.