Index: src/wp-admin/css/about.css
===================================================================
--- src/wp-admin/css/about.css	(revision 45273)
+++ src/wp-admin/css/about.css	(working copy)
@@ -135,7 +135,8 @@
 	font-weight: 400;
 }
 
-.about-wrap h2 {
+.about-wrap h2,
+.about-wrap nav {
 	margin: 40px 0 .6em;
 	font-size: 2.7em;
 	line-height: 1.3;
Index: src/wp-admin/css/colors/_admin.scss
===================================================================
--- src/wp-admin/css/colors/_admin.scss	(revision 45273)
+++ src/wp-admin/css/colors/_admin.scss	(working copy)
@@ -130,7 +130,7 @@
 
 /* Active tabs use a bottom border color that matches the page background color. */
 
-.about-wrap h2 .nav-tab-active,
+.about-wrap .nav-tab-active,
 .nav-tab-active,
 .nav-tab-active:hover {
 	background-color: $body-background;
Index: src/wp-admin/css/common.css
===================================================================
--- src/wp-admin/css/common.css	(revision 45273)
+++ src/wp-admin/css/common.css	(working copy)
@@ -2171,7 +2171,7 @@
 	margin-left: 0.5em; /* half the font size so set the font size properly */
 	padding: 5px 10px;
 	font-size: 14px;
-	line-height: 1.8;
+	line-height: 1.33333333;
 	font-weight: 600;
 	background: #e5e5e5;
 	color: #555;
@@ -2213,6 +2213,7 @@
 
 h1.nav-tab-wrapper, /* Back-compat for pre-4.4 */
 .wrap h2.nav-tab-wrapper, /* higher specificity to override .wrap > h2:first-child */
+.wrap nav.nav-tab-wrapper,
 .nav-tab-wrapper {
 	border-bottom: 1px solid #ccc;
 	margin: 0;
@@ -3993,6 +3994,7 @@
 
 	h1.nav-tab-wrapper,
 	.wrap h2.nav-tab-wrapper,
+	.wrap nav.nav-tab-wrapper,
 	.nav-tab-wrapper {
 		border-bottom: 0;
 	}
@@ -3999,7 +4001,8 @@
 
 	h1 .nav-tab,
 	h2 .nav-tab,
-	h3 .nav-tab {
+	h3 .nav-tab,
+	.wrap nav .nav-tab {
 		margin: 10px 10px 0 0;
 		border-bottom: 1px solid #ccc;
 	}