Long posts and too much empty white sidebar space…

Hi!

I am having some issues with long posts. It leaves a big white space in the sidebar as the are no more available widgets and the post keeps on and on.

I am not sure how to fix this but it really gives an unprofessional look to my blog. I use papyrus theme, here is the stylesheet https://pastebin.ca/1842374

Sorry I can’t switch to another cause I have spend a lot of hours working on the papyrus.

Just an example
https://michaelwillow.com/2009/03/16/is-the-screamo-singing-dangerous-for-the-vocal-chords/
Look how long is the sidebar and it should end after the “your support” widget.