Index: wp-admin/edit-form-advanced.php
===================================================================
--- wp-admin/edit-form-advanced.php	(revision 23582)
+++ wp-admin/edit-form-advanced.php	(working copy)
@@ -384,7 +384,11 @@
 <?php
 }
 
-do_action( 'edit_form_after_title' );
+if ( has_action( 'edit_form_after_title' ) ) {
+	echo '<div class="edit-form-section">';
+	do_action( 'edit_form_after_title' );
+	echo '</div>';
+}
 
 // post format fields
 if ( post_type_supports( $post_type, 'post-formats' ) ) {
@@ -447,7 +451,7 @@
 
 if ( post_type_supports($post_type, 'editor') ) {
 ?>
-<div id="postdivrich" class="postarea">
+<div id="postdivrich" class="postarea edit-form-section">
 
 <?php wp_editor($post->post_content, 'content', array('dfw' => true, 'tabfocus_elements' => 'insert-media-button,save-post', 'editor_height' => 360) ); ?>
 
Index: wp-admin/css/wp-admin.css
===================================================================
--- wp-admin/css/wp-admin.css	(revision 23583)
+++ wp-admin/css/wp-admin.css	(working copy)
@@ -6325,7 +6325,7 @@
 	padding: 0;
 }
 
-#post-body-content {
+.edit-form-section {
 	margin-bottom: 20px;
 }