Add future styling

app/views/attendance_tracker/index.html.erb

@@ -25,7 +25,8 @@
                 </tr>
 
                 <% lectures.each do |lecture| %>
-                  <tr>
+                  <% style = if lecture.start_time.future? then 'background: repeating-linear-gradient(45deg, #f3f4f6, #f3f4f6 10px, white 10px, white 20px);' else '' end %>
+                  <tr style="<%= style %>">
                     <td class="whitespace-nowrap py-4 pl-4 pr-3 text-sm font-medium text-gray-900 sm:pl-6">
                       <%= lecture.nice_title %>
                     </td>