Add a class to product variations in content type

I have a problem displaying multiple variation in a horinzontal row that would be solved if I could separate them from the rest of the $content. I think a class specific to product variations would do the job.

The issue I am getting is that the product variations are stacking up on the left side perhaps because of the length of the body field. I can fix it in chrome with float: left and adding a margin to the bottom of the zoom-container but it doesn't work in Firefox.

I added a class to the node-product-type.tpl.php like this but it's not at the right level:

        // We hide the comments and links now so that we can render them later.
        hide($content['comments']);
        hide($content['links']);
        print render($content);
      

I need to get within the $content and finding the right file is like wading through spaghetti files. If someone knows where to do this, that would be great! Thanks!