Can’t figure out what’s causing this margin

If you look at my page, every single space has the exact same margin. For example – between the post title header and the user ratings, then between the user ratings and the post content, then between the post content and the comments. I can’t figure out what’s causing this. I’ve tried changing all my margins in the stylesheet to 0px but nothing changes. How can I make these gaps smaller or get rid of them?

site: http://moviestinger.com