Donors List css

Newbie web host here.

Just wondering how to go about implementing this:
https://wordpress.org/support/topic/donors-list-display

I tried to add it to charitable.css. Is this something that is part of another plugin that needs to be purchased?

Also turned on the widget to display donors, just wanting to spice up the look some.

Thank you

https://wordpress.org/plugins/charitable/