Want to select items by class in a list (views)

I want to be able to highlight selected items in a list. Each item in the list is generated by a specific content type, and I'm using views to present the list as both a block on some pages, and a separate page. Is there a way to pull out certain items in the list and assign a class? I started by adding a field to the content type, so as to flag the specific item. I tried using Context but haven't been able to make it work. Any ideas on how to make this work? (Site is in Drupal 7).