July 02, 2015
Follow this WordPress Codex example and this support forum comment, add this into your header.php file and style the resulting body class accordingly:
<?php
$class = '';
/* is it a page */
if( is_page()) {
global $post;
$parent = array_reverse(get_post_ancestors($post->ID));
$first_parent = get_page($parent[0]);
$class = $first_parent->post_name;
}
?>
<body <?php body_class($class);?>>
