diff --git a/event/static/js/calendar.js b/event/static/js/calendar.js
index cdd104b..f5d84e4 100644
--- a/event/static/js/calendar.js
+++ b/event/static/js/calendar.js
@@ -167,9 +167,14 @@ class Calendar {
         })
         .appendTo(this.timeSlotsContainerNode);
 
-        if (i > 0 && hour === 0) {
-          timeSlotHourNode.addClass("cal-new-day");
-          timeSlotBlockNode.addClass("cal-new-day");
+        if (hour === 23) {
+          timeSlotHourNode.addClass("cal-last-hour");
+          timeSlotBlockNode.addClass("cal-last-hour");
+        }
+
+        if (hour === 0) {
+          timeSlotHourNode.addClass("cal-first-hour");
+          timeSlotBlockNode.addClass("cal-first-hour");
         }
     }
   }