Increasing the width – both sides

First of all, thanks for this wonderful adn beautiful theme. I’ve installed in no. of my websites. One such site is https://indianwiki.in

Now, I want to use left space and right space of my single post to feel full-width with sidebar.
In other words, how can I shift my post to extreme left and sidebar to extreme right?

Thanks
Gopal