diff --git a/src/main/webapp/GeoportalDataViewer.css b/src/main/webapp/GeoportalDataViewer.css
index 6a26e8d..0ad73b0 100644
--- a/src/main/webapp/GeoportalDataViewer.css
+++ b/src/main/webapp/GeoportalDataViewer.css
@@ -179,7 +179,7 @@ body {
 	padding-left: 5px;
 	overflow-y: auto;
 	transition: width 0.5s;
-	z-index: 1000;
+	z-index: 100;
 }
 
 .overlay {