How can I use gatsby-starter-ghost in the CMS preview?

I currently have the Ghost CMS running on Heroku, and gatsby-starter-ghost running on netlify. The live site looks fine, but how can I also use this theme on the backend?

Bump. Anyone?

I’m not quite sure I understand your question. Do you want to use the Ghost default theme Casper for the Gatsby frontend? Gatsby starter comes with its own - very basic - styles and is not the same like Casper…