anchor.diff:    <table class="costs-table">
       <thead>
         <tr>
  -        <th>Title</th>
  -        <th>Due</th>
  -        <th>Amount</th>
  -        <th>Parent</th>
  +        <th class="costs-col">Title</th>
  +        <th class="costs-col">Due</th>
  +        <th class="costs-col">Amount</th>
  +        <th class="costs-col">Parent</th>
           <th colspan="3"></th>
         </tr>
       </thead>
  
positive.code:     <tbody>
        <% @costs.each do |cost| %>
          <tr>
            <td><%= cost.title %></td>
            <td><%= cost.due %></td>
            <td><%= cost.amount %></td>
            <td><%= cost.parent_id %></td>
            <td><%= link_to 'Show', cost %></td>
            <td><%= link_to 'Edit', edit_cost_path(cost) %></td>
            <td><%= link_to 'Destroy', cost, method: :delete, data: { confirm: 'Are you sure?' } %></td>
          </tr>
        <% end %>
      </tbody>
  
negative.code: 
    <br>
  
    <%= link_to 'New Cost',class: 'new-cost', new_cost_path %>
  
  </section><!--.costs-container-->
  