Blank space between product listings

Hello,
I've been customizing ZC for a client and have found most of what I need (although in reading through this forum, I'm now realizing that I made a bunch of changes in HTML, rather than relying solely on the admin and CSS - now I know for next time!)

My question is about adding space between product listings. I've found code that makes it look like there should be a place in admin to turn this on, but I haven't found the admin option. Can someone point me toward the correct setting?

The site is still on a testing server, so I can't give you a URL. Thanks!
Leah

Add to your stylesheet

.productListing-even, .productListing-odd {
    margin-bottom: 23px;
    }
```Adjust to taste. You can also add a border-bottom and padding.

Thanks for the response. This didn't actually work for me, but it got me into the right part of the style sheet where I discovered that if I manipulate the margin around the image it works. Thanks!