Add white space between thumbnails

I need help with to add white space between the thumbnails on my page that I have provided in this post. Currently they are butting up next to each other in the row. I would like to have some spacing in between the images. The page is a standard page with a simple short code to display the items.

[product_category category=”JLG General” per_page=”200″ columns=”4″ orderby=”date” order=”desc”]

Is it done in the short code or the CSS? I’ve tried a bunch of different solutions and nothing has worked. Thanks in advance for any help.

The page I need help with: [log in to see the link]

 

This site will teach you how to build a WordPress website for beginners. We will cover everything from installing WordPress to adding pages, posts, and images to your site. You will learn how to customize your site with themes and plugins, as well as how to market your site online.

Buy WordPress Transfer