I'm building a site around the Graphene theme, which I like very much. I'm using pages rather than posts and I have them set up with a parent page with associated child pages. Right now the full parent page appears at the top of the page followed by the child pages (the child pages just have the intro text followed by readmores to the full child page). So that's easy, like setting up a blog page with a sticky post at the top followed by other related posts.
In the current arrangement the child page intros are in a single column below the intro page. What I'd like to know is how to change the child page intros from a single column to 2 columns below the intro page text. Is this possible?
I work mostly in Joomla, where doing this kind of content arrangement is very simple, but I'm not seeing a solution in WP so I'd appreciate any help you can give me.