[Theme: Virtue] How to center content on category page & single posts by default

Hi,

I would like to center all my content without any sidebar for my blog page, single post pages, category page and searches.

1. I have tried editing the blog page and selecting “full width” but that only works for this page. Any way to do this for all posts by default instead of having to edit all the individual posts?

2. When I click on blog categories (travel, photography etc), the posts from that category are displayed with an invisible sidebar to the right, and this makes the content appear lopsided. Is there a way to center all content regardless of which page it is?

Thanks so much.