question about borders within page sections

Hello, running GP Remium 1.12.3

I would like to know if there is some code I could add to the posts so that there is a defined border around each post. I did the google rounds and I found some old generatepress support topics on some of the ccs code.

I would like to have a border around a certain group of paragraphs and some shadows, if possible.

Essentially, I would like to easily segment grouped paragraphs for the eye on a long post.

I've included a link to what I have now on the site and an image of something that I would like.

Any guidance would be appreciated.
TY