diff --git a/navalplanner-webapp/src/main/webapp/common/css/navalplan_zk.css b/navalplanner-webapp/src/main/webapp/common/css/navalplan_zk.css
index 9ba5659c9..ebf5b6125 100644
--- a/navalplanner-webapp/src/main/webapp/common/css/navalplan_zk.css
+++ b/navalplanner-webapp/src/main/webapp/common/css/navalplan_zk.css
@@ -559,7 +559,7 @@ div.z-row-cnt {
     font-size: 11px;
 }
 
-div.z-footer-cnt,div.z-row-cnt,div.z-group-cnt,div.z-group-foot-cnt,div.z-column-cnt {
+div.z-footer-cnt,div.z-row-cnt,div.z-group-cnt,div.z-group-foot-cnt,div.z-column-cnt,div.z-tree-col-cnt {
     font-family: Tahoma, Arial, Helvetica, sans-serif;
     font-size: 11px;
     font-weight: bold;