How do you convert a Rails 5 API app to a rails app that can act as both API and app?

Question

I initially created it in rails 5 with the --api tag.

From http://edgeguides.rubyonrails.org/api_app.html,

I removed config.api_only = true

Answer 1

So there's probably more things that will need to be done as I (you) go along, but to resolve the issue with stylesheets you need to manually create your views/layouts/application.html.erb and assets/stylesheets/application.css files.