diff --git a/plugins/libkolab/skins/elastic/include/calendar.less b/plugins/libkolab/skins/elastic/include/calendar.less
index 276034b1..479803ef 100644
--- a/plugins/libkolab/skins/elastic/include/calendar.less
+++ b/plugins/libkolab/skins/elastic/include/calendar.less
@@ -655,8 +655,9 @@ body.task-calendar {
 
     @media screen and (min-width: (@screen-width-small + 1px)) {
         #layout-sidebar {
-            flex: 2 !important;
+            flex: 2;
             max-width: 400px;
+            min-width: 240px;
         }
     }