I am using Drupal 7. I have a question/answer website, I want to theme reply comments differently from node comments. How can I apply a different css theme to differentiate node comments from comment replies? I checked the css class and both node comments and comment replies have the same css class. So how do I add different css class to comment replies and theme them differently?
Clarification: My question is just about theming comment replies differently, like removing borders around them or adding background to all comment replies, while node comments (answers) remain same.