anchor.diff:            </div>
           </div>
           <div class='centered'>
  -          <%= form.submit %>
  +          <%= form.submit 'Save', class: 'btn btn-primary'%>
  +          <%= link_to 'Back', :back, class: 'btn btn-info' %>
           </div>
         <% end %>
       </div>
  
positive.code: 
            <div class='form-group'>
              <%= form.label :dob %>
              <%= form.date_select :dob, id: :profile_dob, class: 'form-control' %>
              <%= form.error_message_for(:dob) %>
            </div>
  
  
negative.code:             <% if profile.image.present? %>
                <%= image_tag profile.image[:large_thumb].url, class: 'img-thumbnail' %>
                <% if profile.has_profile_pic %>
                  <div class='checkbox'>
                    <%= form.label :remove_image do %>
                      <%= form.check_box :remove_image %>Remove photo
                    <% end %>
                  </div>
                <% end %>
              <% end %>
              <%= form.hidden_field :image, value: form.object.cached_image_data %>
              <%= form.file_field :image, id: :profile_image, class: 'btn btn-primary btn-md btn-block' %>
              <%= form.error_message_for(:image) %>
            </div>
          </div>
  