Remove references and styles for column selection

Also gently restyle the Examine page
I was keeping the formatting the same as the rest of the document, but in general I dislike extra newlines after each rule. There are many rules in a file, and it seems wasteful to add a blank line after every single declaration. Separating semantic blocks of rules with a newline is a good thing, though. There are other guides (e.g. [GitHub's](https://github.com/styleguide/css)), and IIRC most CSS I've read, which prefer this style of newline.