This is the code/file locations for using Joomlashine Tempalte Styling within JCE Editor.

Dont forget the commas.

Uses $template instead of the explicit template name

templates/$template/css/template.css,
templates/$template/css/template_pro.css,
templates/$template/css/colors/blue.css,
templates/$template/css/styles/business.css, (or custom.css for those google fonts/ custom font setting)
templates/$template/css/lancastrian.css

Template name explicitly used.

templates/jsn_epic_pro/css/template.css,
templates/jsn_epic_pro/css/template_pro.css,
templates/jsn_epic_pro/css/colors/blue.css,
templates/jsn_epic_pro/css/styles/business.css,  (or custom.css for those google fonts/ custom font setting)
templates/jsn_epic_pro/css/lancastrian.css

This is the default editor file for JCE. This is just incase there are any conflicts you will know where to look.

components/com_jce/editor/tiny_mce/themes/advanced/skins/default/content.css