Index: src/wp-admin/css/customize-nav-menus.css
===================================================================
--- src/wp-admin/css/customize-nav-menus.css	(revision 38190)
+++ src/wp-admin/css/customize-nav-menus.css	(working copy)
@@ -19,7 +19,8 @@
 /* The `edit-menu` button uses also the `button-link` class. */
 .customize-control-nav_menu_location .edit-menu {
 	margin-left: 6px;
-	vertical-align: middle;
+	line-height: 28px;
+	font-size: 14px;
 	color: #0073aa;
 	text-decoration: underline;
 }