Oh joyous day! I finnaly found out how to resize that horribly overgrown disqus box at the bottom pf the page. I took 2 min. It’s funny that I didn’t find the solutin when I actively searched for it a while ago but found it today while searching for something else.
The short story is:
padding:30px 45px 0pt;
between the <style>…</style> tags at the beginning of the theme.
Here’s the thread where I found the answer.