Applying K2 Category Description Style to Modules/Content Text

I would like to apply the nice rounded edge, slightly gradient box that holds K2 Category Description text to highlight an intro paragraph on a regular K2 item in item detail view.

Is there a way to do that. I assume it would involve borrowing or copying something from a css file or knowing which div class to apply, like you do in typography variations but I have not been able to find what I'm looking for.

Can anyone assist in giving me details on how to do this or where to look for what I need.

Thanks in advance for any/all help.