Sidebar is not an ordinary WordPress. It has a responsive layout with a unique positioning of the navigation. It looks like no other free WordPress theme on the web.
It is not the most flexible theme you will come up with, but there are some settings and styling options built-in. Theme Customizer empowers you change some aspects of the theme without having to touch any code.
This theme is available for download at Theme Kult together with a few more unique freebies. Simplicity and clarity in reading is a distinctive feature in all of those themes.