anchor.diff:                <td><%= activity.start %></td>
                 <td><%= activity.end %></td>
                 <td><%= activity.location %></td>
  -              <td style="text-align: center;">  
  +              <td style="text-align: center;">
                   <% if activity.permission_slip %>
                     <span class="glyphicon glyphicon-ok" aria-hidden="true"></span>
                   <% else %>
  
positive.code:             <% if @current_teacher.present? %>
                <th>View Activity</th>
              <% end %>
            </tr>
            <% @activities.each do |activity| %>
              <% if activity.end.to_date < Date.today.to_date %>
          <!-- Completed activity -->
                <tr>
                  <td><%= activity.name %></td>
                  <td><%= activity.start %></td>
                  <td><%= activity.end %></td>
                  <td><%= activity.location %></td>
                  <td style="text-align: center;">  
                    <% if activity.permission_slip %>
                      <span class="glyphicon glyphicon-ok" aria-hidden="true"></span>
                    <% else %>
                      <span class="glyphicon glyphicon-remove" aria-hidden="true"></span>
                    <% end %>
                  </td>
                  <% if @current_teacher.present? %>
                    <td>
                      <%= link_to activity_path(activity), class: "btn btn-primary" do %>
                        <i class="glyphicon glyphicon-eye-open"></i>
                      <% end %>
                    </td>
                  <% end %>
                  <% if @current_student.present?  %>
                    <% attending = activity.students.exists? @current_student.id %>
                  <% end %>
                </tr>
              <% end %>
            <% end %>
          </table>
    </div>
  </div>
negative.code:         <% end %>
        </p>
      <% end %>
  
      <h2> Current event </h2>
        <table class="table table-hover table-responsive">
  