Our detectives are back with the following intel on this WordPress site
The site is using the Cosimo theme by Rizzo Andrea - CrestaProject.com .
We could identify 2 plugins (there might be more) - All in One SEO Pack and WP Super Cache
Cosimo is fresh & beautiful responsive WordPress Blog Theme, a large column in the center of the screen, and the sidebar that appears when you click on the appropriate button, unlimited colors and theme options. Demo here http://crestaproject.com/demo/cosimo/