body class addd

<?php 
function themename_body_classes( $classes ) {
	// body calss for page
 if ( is_singular( 'page' ) ) {
  global $post;
  $classes[] = 'page-' . $post->post_name;
 }
 	return $classes;
}
add_filter( 'body_class', 'themename_body_classes' );