diff --git a/theme/style.less b/theme/style.less
index c1fe5a7b..650bac34 100644
--- a/theme/style.less
+++ b/theme/style.less
@@ -64,7 +64,7 @@ span.blocklyTreeLabel {
 .blocklyToolboxDiv, .monacoToolboxDiv {
     background-color: white !important;
     border-left: 1px solid #ecf0f1 !important;
-    box-shadow: 0px 0px 2px 0px rgba(0,0,0,0.12), 0px 0px 2px 0px rgba(0,0,0,0.24);
+    box-shadow: 4px 0px 2px -4px rgba(0,0,0,0.12), 4px 0px 2px -4px rgba(0,0,0,0.24);
 }
 
 .blocklyFlyoutBackground {