diff --git a/calendar/templates/default/app.css b/calendar/templates/default/app.css
index 8648756108..ea0bbf00e1 100644
--- a/calendar/templates/default/app.css
+++ b/calendar/templates/default/app.css
@@ -271,7 +271,7 @@ e.g. the div with class calendar_calTimeGrid is generated by the timeGridWidget
 	z-index: 40;
 }
 .calendar_calDayColHeader .hiddenEventBefore {
-	height: 4px;
+	height: 3px;
 	bottom: -7px;
 	border-top: none;
 }
@@ -281,6 +281,7 @@ e.g. the div with class calendar_calTimeGrid is generated by the timeGridWidget
 	border-left: 1px;
 	border-right: 1px;
 	border-top-left-radius: 0px;
+	border-top-right-radius: 0px;
 	background-color: white;
 }
 .calendar_calDayCol .hiddenEventAfter {