anchor.diff:            <td><%= meter.meter_type.humanize %></td>
             <td>
               <div class="btn-group">
  -              <%= link_to 'Delete', school_meter_path(@school, meter), method: :delete, data: { confirm: 'Are you sure?' }, class: 'btn btn-danger' %>
  -              <%= link_to 'Activate', activate_school_meter_path(@school, meter), method: :put, class: 'btn btn-success' %>
  +              <%= link_to 'Delete', school_meter_path(@school, meter), method: :delete, data: { confirm: 'Are you sure?' }, class: 'btn btn-sm btn-danger' %>
  +              <%= link_to 'Activate', activate_school_meter_path(@school, meter), method: :put, class: 'btn btn-sm btn-success' %>
               </div>
             </td>
           </tr>
  
positive.code:           <td><%= meter.meter_type.humanize %></td>
            <td>
              <div class="btn-group">
                <%= link_to 'Edit', edit_school_meter_path(@school, meter), class: 'btn btn-warning' %>
                <%= link_to 'Deactivate', deactivate_school_meter_path(@school, meter), method: :put, class: 'btn btn-secondary' %>
              </div>
            </td>
          </tr>
  
negative.code:   <% if @inactive_meters.any? %>
      <thead>
        <tr>
          <th colspan="4">Inactive meters</th>
        </tr>
      </thead>
      <tbody>
  