diff --git a/theme/style.less b/theme/style.less
index dbfa2557..48d39a54 100644
--- a/theme/style.less
+++ b/theme/style.less
@@ -46,7 +46,7 @@
 *******************************/
 
 div.blocklyTreeRow {
-    box-shadow: 0 1px 0 #ecf0f1 inset;
+    box-shadow: inset 0 -1px 0 0 #ecf0f1;
 
     margin-bottom: 0px !important;