Margin between products

[NateL]

I'm having a little bit of trouble getting my products to display properly.

When I click on a category that contains products, they are presented in a list.

Each product has pictures, but the pictures are butted right up to each other. I just want to add some 10px margins between each table row - so I've added this code to the bottom of my stylesheet.css - and it does not work.

tr.productListing-odd{
    background-color:green;
    margin-bottom:10px;
}

Now, I put the bg color as "green", just so I could see that the page is indeed picking up that style - and yes, it is, but my margin is still not there! I hope it's something i'm simply looking over...