Wordpress Plugin Custom CSS Development

I am looking for some assistance styling a page with custom CSS for a Wordpress Plugin from Hostaway. The plugin has 3 pages that are automatically generated that will require custom code to be written for each page. The pages are the booking search page, property details page, and the reservation confirmation page. The Hostaway Plugin has an option where you can add your custom CSS to the plugin to style the pages.

The Project Details:
3 pages - require custom CSS styling
WordPress
Plugin: Hostaway
Mobile Friendly / Responsive