How to theme a Quiz in Drupal 7? - part 2 Trying to customize the look and feel of my quizzes in D7 - and getting overwhelmed. I have the Skeleton base theme installed. 

Calling this Part 2 because - this is an extension of How to theme a quiz in D7?. 

Help sought: Which CSS files specifically to target to change the Quiz Take page?

I have added the quiz-single-question-node.tpl.php file - and rendered the $question_node->content['body']. And now the quiz works fine... (but without my desired changes yet).

My problem is that the 'body' from above is a fully formed HTML Form of the quiz question. SO, where exactly should I look to:
a. change this body to perhaps add a CSS class?
b. where should I add the CSS class itself?  

Would really appreciate some detailed hand-holding. 

Thanks in advance.
\sites\all\modules\quiz\Quiz.css --> this is the place to change. 

CSS class definition to be created for: "quiz-question-body" - this is for the question itself.