Treebook page styling is removed after deploying to Heroku

I'm at the "Deploying Treebook to Heroku" step of the "Build a Simple Ruby on Rails Application" course.

I was able to successfully deploy to Heroku after migrating the database, but for some reason my site lost all of it's styling: http://stormy-plateau-4668.herokuapp.com/ (Update: changed it to http://footbook.herokuapp.com, but the problem still occurs)

When I run my app locally, the styling and functionality is intact.

Here are the steps I took to deploy to Heroku:

gem 'devise'
gem 'simple_form', '~> 2.1.0'

group :development, :test do
gem 'sqlite3'
end

group :production do
gem 'pg'
end

1. git push heroku master (got the sqlite3 error)
2. Modified the Gemfile to resolve the sqlite3 error (see above)
3. git add .
4. git commit
5. git push heroku master (got the error page because I didn't install the new bundle)
6. bundle install --without production
7. git add .
8. git commit
9. git push heroku master (got the error page because I didn't migrate the db)
10. heroku run rake db:migrate

I repeated steps 9 and 10 a few times as a sanity check, but the styling is still gone. Any ideas of how to fix this? It's driving me crazy being that I'm so close to the finish line! Jim Hoskins