how to apply stylesheet to subpages?

Here is the answer in case someone needs it ??

function ccss_save() {
	global $post_ID;

	if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE ) return;
	if (!current_user_can( 'edit_post', $post_id ) ) return;

	$id = $_POST['post_ID'];
	$css_sheet = $_POST['ccss'];

	// no need to keep extra info in db for posts/pages without an extra stylesheet.
	if ($css_sheet != '-1') {
 	update_post_meta($id, 'css_sheet', $css_sheet);

	// adds style to subpages
 	$args=array(
  		'child_of' => $id
	);
	$pages = get_pages($args);
	if ($pages) {
	  $pageids = array();
	  foreach ($pages as $page) {
	  	update_post_meta($page->ID, 'css_sheet', $css_sheet);
	  }
	}
 }
 else {
  delete_post_meta($id, 'css_sheet');
	// removes style from subpages
 	$args=array(
  		'child_of' => $id
	);
	$pages = get_pages($args);
	if ($pages) {
	  $pageids = array();
	  foreach ($pages as $page) {
	  	delete_post_meta($page->ID, 'css_sheet');
	  }
	}
 }
}