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:                   <%= link_to activity_path(activity), class: "btn btn-primary" do %>
                      <i class="glyphicon glyphicon-eye-open"></i>
                    <% end %>
                  </td>
                  <td>
                    <%= link_to edit_activity_path(activity), class: "btn btn-info" do %>
                      <i class="glyphicon glyphicon-pencil"></i>
                    <% end if activity.teacher_id == @current_teacher.id %>
                  </td>
                  <td>
                    <%= link_to activity_path(activity), method: :delete, class: "btn btn-danger" do %>
                      <i class="glyphicon glyphicon-trash"></i>
                    <% end if activity.teacher_id == @current_teacher.id %>
                  </td>
                <% end %>
                <% if @current_student.present?  %>
  
negative.code:           <th>Permission Slip?</th>
            <% if @current_teacher.present? %>
              <th>View Activity</th>
            <% end %>
            <% if @current_student.present? %>
              <th>View Activity</th>
  