"Sidebar" distracts Posts

Hello,
at the moment I’m setting up the theme for my new website (http://deutschrapreleases.de/).

In the sidebar there was a default archive box, which I didn’t want. So I deleted all the archive-stuff out of the sidebar.php – it’s gone now.

New Problem: The space the sidebar.php had can’t be used (for example: http://deutschrapreleases.de/r/raf-camora-therapie-nach-dem-tod/)

But I want it that the whole “white area” can be used for my posts. I guess I have to increase the width or something like that?

I uploaded the whole theme as a .rar file, maybe someone can take a look at it and help me out. 🙂

http://deutschrapreleases.de/responsive.rar