diff --git a/app/assets/stylesheets/calendar.scss b/app/assets/stylesheets/calendar.scss
index 0ccb56f..ac9e21f 100644
--- a/app/assets/stylesheets/calendar.scss
+++ b/app/assets/stylesheets/calendar.scss
@@ -147,10 +147,6 @@
 	vertical-align: bottom;
 }
 
-.calendar_mode {
-	z-index: 2;
-}
-
 .mode_switch {
 	text-transform: capitalize;
 }
diff --git a/app/assets/stylesheets/fullcalendar.css b/app/assets/stylesheets/fullcalendar.css
index 475287b..4482ac0 100644
--- a/app/assets/stylesheets/fullcalendar.css
+++ b/app/assets/stylesheets/fullcalendar.css
@@ -479,7 +479,6 @@ a.fc-event:hover {
 /* ---------------------------------------------------------------------------------------------------- */
 .fc-event .fc-event-main {
     position: relative;
-    z-index: 2;
   }
 /* dragging */
 /* ---------------------------------------------------------------------------------------------------- */
@@ -708,7 +707,7 @@ A HORIZONTAL event
   display: table; }
 .fc .fc-daygrid-body { /* a <div> that wraps the table */
     position: relative;
-    z-index: 1; /* container inner z-index's because <tr>s can't do it */
+    /* container inner z-index's because <tr>s can't do it */
   }
 .fc .fc-daygrid-day.fc-day-today {
       background-color: rgba(255, 220, 40, 0.15);
@@ -737,7 +736,6 @@ A HORIZONTAL event
 }
 .fc .fc-daygrid-day-number {
     position: relative;
-    z-index: 4;
     padding: 4px;
   }
 .fc {
@@ -800,11 +798,9 @@ A HORIZONTAL event
 
 }
 .fc .fc-daygrid-event {
-    z-index: 6;
     margin-top: 1px;
   }
 .fc .fc-daygrid-event.fc-event-mirror {
-    z-index: 7;
   }
 .fc {
 
@@ -821,7 +817,6 @@ A HORIZONTAL event
   display: table; }
 .fc .fc-daygrid-more-link {
     position: relative;
-    z-index: 4;
     cursor: pointer;
   }
 .fc {
@@ -831,7 +826,6 @@ A HORIZONTAL event
 }
 .fc .fc-daygrid-week-number {
     position: absolute;
-    z-index: 5;
     top: 0;
     padding: 2px;
     min-width: 1.5em;
@@ -1048,14 +1042,14 @@ A VERTICAL event
       bottom: calc(var(--fc-event-resizer-dot-total-width, 8px) / -2);
     }
 .fc .fc-timegrid .fc-daygrid-body { /* the all-day daygrid within the timegrid view */
-    z-index: 2; /* put above the timegrid-body so that more-popover is above everything. TODO: better solution */
+    /* put above the timegrid-body so that more-popover is above everything. TODO: better solution */
   }
 .fc .fc-timegrid-divider {
     padding: 0 0 2px; /* browsers get confused when you set height. use padding instead */
   }
 .fc .fc-timegrid-body {
     position: relative;
-    z-index: 1; /* scope the z-indexes of slots and cols */
+    /* scope the z-indexes of slots and cols */
     min-height: 100%; /* fill height always, even when slat table doesn't grow */
   }
 .fc .fc-timegrid-axis-chunk { /* for advanced ScrollGrid */
@@ -1068,7 +1062,6 @@ A VERTICAL event
     }
 .fc .fc-timegrid-slots {
     position: relative;
-    z-index: 1;
   }
 .fc .fc-timegrid-slot { /* a <td> */
     height: 1.5em;