diff --git a/calendar/templates/default/app.css b/calendar/templates/default/app.css
index 2f4e2f28f7..8ed77c702c 100644
--- a/calendar/templates/default/app.css
+++ b/calendar/templates/default/app.css
@@ -271,8 +271,8 @@ e.g. the div with class calendar_calTimeGrid is generated by the timeGridWidget
 	z-index: 40;
 }
 .calendar_calDayColHeader .hiddenEventBefore {
-	height: 3px;
-	bottom: -7px;
+	height: 2px;
+	bottom: -6px;
 	border-top: none;
 }
 .calendar_calDayColHeader .hiddenEventBefore:hover {