diff --git a/public/css/calendar.less b/public/css/calendar.less
index f38bd8d65..dc703693b 100644
--- a/public/css/calendar.less
+++ b/public/css/calendar.less
@@ -425,6 +425,10 @@
     }
   }
 
+  .column-title:not(:first-of-type) {
+    border-left: 1px solid @gray-lighter;
+  }
+
   .row-title {
     color: @text-color-light;
   }