Index: src/wp-admin/css/common.css
===================================================================
--- src/wp-admin/css/common.css	(revision 35491)
+++ src/wp-admin/css/common.css	(working copy)
@@ -2018,7 +2018,7 @@
 }
 
 h1.nav-tab-wrapper, /* Back-compat for pre-4.4 */
-h2.nav-tab-wrapper,
+.wrap h2.nav-tab-wrapper, /* higher specificity to override .wrap > h2:first-child */
 h3.nav-tab-wrapper {
 	border-bottom: 1px solid #ccc;
 	margin: 0;