How to use with Divi and change style?

This is a test page. I am wanting to be able to display by categories, but also change the thumbnails and design.

I am using Divi, but my main concerns are to have the thumbnails landscape and to display the title of the image on the thumbnail. I did change the thumbnail size in the settings, but they are not rendering correctly. Also, there is a lot of space in between.

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