title: How to remove bootstrap-sass from Ruby on Rails 5.0.2
body: <p>I'd like to remove bootstrap-sass 3.3.7 from ruby on rails. I installed <em>gem bootstrap-sass</em> a month ago. However, I created design by myself. So I would like to uninstall bootstrap-sass.</p>
  
  <p>I tried </p>
  
  <pre><code>gem uninstall gem bootstrap-sass
  
  rake assets:clean
  </code></pre>
  
  <p>but, bootstrap was not removed.</p>