diff --git a/navalplanner-webapp/src/main/webapp/planner/css/ganttzk.css b/navalplanner-webapp/src/main/webapp/planner/css/ganttzk.css
index 09ab56b48..4cc2ece5e 100644
--- a/navalplanner-webapp/src/main/webapp/planner/css/ganttzk.css
+++ b/navalplanner-webapp/src/main/webapp/planner/css/ganttzk.css
@@ -159,6 +159,7 @@
     text-align: center;
     vertical-align: middle;
     cursor: pointer;
+    z-index : 99;
 }
 
 /* Task lane properties */