anchor.diff:          </style>
   
           <%= stylesheet_link_tag 'https://factor.io/assets/landing.css' %>
  +        <%= stylesheet_link_tag '//maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css' %>
           
       </head>
   
  
positive.code:                       <a href="/<%= previous_page.path %>" class='step_link'>Previous: <%= previous_page.data.title %></a>
                      <% end %>
                    <% end %>
                  </div>
              </div>
  
  
negative.code:             /*<%= Rouge::Themes::Base16.mode(:light).render(scope: '.highlight') %>*/
              <%= Rouge::Themes::Github.render(scope: '.highlight') %>
  
              div.edit{
                margin-top: 40px;
                width: 100%;
                /*background-color: #fff;*/
                color: #999;
              }
              div.edit > a {
                color: #999;
                text-decoration: none;
              }
              div[role=main] > .step_link{
                text-decoration: none;
              }
  