WP Post Styling

This plugin adds a custom field to post editing screens to add custom styles that apply only to that page or post. Users can attach custom styles for print, screen, or mobile, and store frequently-used styles in a library. To use the style library, users must add the styles they want on the settings page, navigate to the article that requires specific styles, select the library style from the drop-down, and update or post the new document. Custom styles will not be included on archive pages, only on single post/Page views.