Page Builder Help

I am using Page Builder with a Vantage theme to build a web site. I have searched the forum posts and am not understanding what I need to do to create custom css for a couple of sections on my front page. I need to do the custom css in order to have the listings be at least three across instead of in a list. I know how to get to the custom css where there is attributes, layout, etc. but nothing that I have put in the custom css works.

Any help with this would be greatly appreciated.

URL: http://www.northwestarkansasdirectory.com