Layout Issues with single post page

Hi there,

I am using the free Version of SKT Full Width Theme and I installed an Job Manager plugin.
All is working fine beside the singel post page.
here is the URL: https://nordhausen-pipeband.de/jobs/hexenumzug-schierke

Another Problem, I want to inlarge the width of the Content or textarea a bit.

How can I fix These 2 Problems?

Many thanks