You need to see the SASS references instead of the generated CSS. Do the following to see it.
Install the following:
group :development do
gem 'sass-rails-source-maps'
gem 'sass', '>= 3.3.0.rc.6'
endNote: we need the latest sass gem which is currently at RC6 on 5th March 2014. Update it to stable if there is one available now.
Next, bundle it.
Next, remove cache rm -rf public/assets and rm -rf tmp/cache/assets.
Load up your Chrome and you should see the references to SCSS files instead of CSS files in the developer toolbars.