Redactor provides a way to specify custom styles for content in the editor. It's documented here: http://imperavi.com/redactor/examples/typography/
How can I use this approach with Craft?
I've already added custom formatting options to the menu via formattingAdd. That works great and the corresponding custom CSS classes are being applied in the formatting menu, the editor text, and on the site front-end.
But the items in the formatting menu and the editor just look like standard paragraph elements and don't reflect any of the styles that they will have on the site.
Where do I put the CSS so that when my clients are working in the control panel, the styles are visible in the formatting menu and the editor when they are applied?