Constructor – article header too wide

Hi – I put together a child theme for follen.org, and the header in the main article (around “Home”) is too wide; it overlaps the top of the sidebar on the home page. The overlap is even worse on this page: http://follen.org/?page_id=374 (around “Frequently Asked Questions.”

I’ve been poking around in the stylesheet and changing various parameters, but I’m not having any luck.

I’d really like to eliminate the box altogether and just have white space around the page title. How can I do this?