anchor.diff:          <li>
             <%= button_to 'Delete list', topic_list_path(@topic, list),
                   method: :delete,
  -                class: 'js-confirm',
  +                class: 'js-confirm btn btn-sm btn-danger',
                   :'data-confirm-text' => 'Are you sure you want to delete this list and all its content?'
             %>
           </li>
  
positive.code:   <h2>New list</h2>
    <%= f.text_field :name %>
  
    <button class='btn btn-primary'>Create</button>
  <% end %>
  
  <div class="curated-lists">
  
negative.code:         <% @topic.untagged_list_items.each do |list_item| %>
            <tr>
              <td class='title'><%= list_item.title %></td>
              <td class='remove'>
                <%= button_to 'Remove', topic_list_list_item_path(@topic, list_item.list, list_item),
                  method: :delete, class: 'btn btn-sm btn-danger' %>
              </td>
            </tr>
          <% end %>
        </tbody>
  