Adjust notebook cell toolbar shadow

src/vs/workbench/contrib/notebook/browser/media/notebook.css

@@ -179,7 +179,11 @@
 	right: 32px;
 	top: 0px;
 	z-index: 10;
-	box-shadow: 0px 0px 12px rgba(0, 0, 0, 0.2);
+	box-shadow: 0 0 8px 4px rgba(0, 0, 0, 0.2);
+}
+
+.vs .monaco-workbench .part.editor > .content .notebook-editor > .cell-list-container > .monaco-list > .monaco-scrollable-element > .monaco-list-rows > .monaco-list-row > .monaco-toolbar {
+	box-shadow: 0 0 8px 4px rgba(168, 168, 168, 0.1);
 }
 
 .monaco-workbench .part.editor > .content .notebook-editor > .cell-list-container > .monaco-list > .monaco-scrollable-element > .monaco-list-rows > .monaco-list-row > .monaco-toolbar .action-item {