FACEBOOK Comment PLUGIN THAT SCROLLS

I have searched and searched and i am sure it is posted somewhere already but maybe i am using the wrong termanology. I am looking for a wordpress plugin that is contained area that scrolls so that someone can read numerous post of if a post is long will not take up the whole side bar. an exact example of what i am looking for is on the left sidebar of the site https://kvministries.com/ I know it is probably simple and there probably is a plugin for it but i have tried most of the plugins i can find–if it is a simple plugin with a feature i have to turn on please let me know–i have been coding for a while and can follow instructions very well.

thanks for the help