How can I customize the Ride theme's listing setup and add a product gallery?

Hello, I currently have the “Ride” theme for my store, however I love everything about it except for the listing setup. Is there a way to change the black box around the listings? I’d prefer a white or blue to match my brand colors, and alos how would I change it so that the entire photo shows because as it stands now, it’s cropped. Also, on the main page I wanted to be able to have a gallery under “Best Sellers” with a picture and the customer able to click on the picture and it takes them directly to the item. This was an available feature on the Debut theme, but I don’t see it on the Ride theme. Is there a way I can add it to it? Coding maybe? If so, could someone walk me through how to do that.

Here is my website to view, thank you. www.americanblues56.com

I just figured out how to fix how the listings look. In the customize option for the website, click product grid and change Image Ratio to adapt to first image, then to change the black box around it go to theme settings-style-change to standard