Center main content

I’ve been unable to center the main content on my home page. The header graphic (the website title) is centered, but the container for the content is off-center to the left. I’ve tried adding Additional CSS to try to center all of the classes I can see that make up the main content, but nothing seems to move the (white) block to the center. What am I overlooking?

The page I need help with: [log in to see the link]