Allow CSS to be applied to form links as well as embedded forms

It's great that Populi allows CSS to be applied to embedded forms. But if we want only use embedded forms AND take full advantage of lead sources, we would need to route every lead source to a different webpage containing the embedded form. If we could apply CSS to our form links, then we can just provide different Populi links for every lead source and still have the form include our logo and match our branding.