diff --git a/src/main/java/org/gcube/portlets/user/workspace/public/workspacetree.css b/src/main/java/org/gcube/portlets/user/workspace/public/workspacetree.css
index f32f01e..4f3053a 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/public/workspacetree.css
+++ b/src/main/java/org/gcube/portlets/user/workspace/public/workspacetree.css
@@ -6,7 +6,7 @@
 	box-shadow: none;
 	line-height: 7px;
 	opacity: 1;
-	z-index: 1000;
+	z-index: 1500;
 	background-color: #FFFFFF;
 }