Views: Is it possible to Group "exposed" filters in a  and add css to it? In Drupal 7, I have a Views which contained "content: ID", "Content: Type", "Content: Title", "Content: Organization", Conent: City", "Content: State" and "Date: Date(node)". They are all exposed. How can I group them into 3  groups(the group in rearrange only give the feature to add "and" or "or" group), so I can add CSS and make them as an expandable list. Is it possible?
Exposed filters appear in a form so you have to use hook_form_alter
as well as hook_theme to theme any form.

Using hook_form_alter assign a new theme to that particulat form.
hook_theme is usead for register a new theme.

For more information about form theming visit here