diff --git a/calendar/templates/default/app.css b/calendar/templates/default/app.css
index 05bbe89677..db6c9c8ecb 100644
--- a/calendar/templates/default/app.css
+++ b/calendar/templates/default/app.css
@@ -218,6 +218,8 @@ e.g. the div with class calTimeGrid is generated by the timeGridWidget method of
 	border-style: solid;
 	border-radius: 6px;
 	-moz-border-radius: 6px;
+	max-height: 400px;
+	overflow: auto;
 }
 
 .calAddEvent{