URL at: thawing-cliffs-1703.herokuapp.com/
Problems with Heroku can be caused by not running
heroku run rake db:migrate
which updates the heroku/production/postgres database with local/sqlite3 changes. Another tip I read is to precompile assets locally if the custom CSS is taking too long to load. This can be done by running
RAILS_ENV=production bundle exec rake assets:precompile git push heroku master heroku open