We frequently find the need to make page specific CSS changes but DNN doesn't make this easy. It currently has the ability to specify a CSS file for a page but it'd be much cleaner to just let admins specify a class. So, on page settings, just add a field for Wrapping CSS Class with a textbox and a validator to prevent non-alphanumeric chars. Then on render, add the class to an appropriate wrapping element. I've done this with JS in some cases but it'd be a simple and powerful enhancement.