I would appreciate your help in finding a solution to my problem.

My site is https://gorylektury.baturo.pl, template: Chelsea

In the sidecol position on the left there is a long list of articles. In the maincontent on the right there are articles that are much shorter than the list in the sidecol. How do I make the list in the sidecol dynamically adjust in height to the height of the article in the maincontent? The list in the sidecol should be scrollable.