application.css not served on Heroku

[Ciprian Dunareanu]

Ive added my own css file in app/assets/stylesheets/application.css

registered the style with

config.register_stylesheet "application.css", :media => 'screen'

Works fine in development.

For production I did the following:

in Gemfile:

gem 'rails_12factor'

in config/assets.rb

Rails.application.config.assets.precompile += %w( application.css )

in application.rb

config.assets.initialize_on_precompile = true

but Heroku still fails to serve the css file.

Any thoughts?