Add a class of 'page' to the body element on WordPress pages.

classy_pages.php

<?php
/*
Plugin Name: Classy Pages
Plugin URI: http://tarskitheme.com/
Description: Add a class of <code>page</code> to the <code>body</code> element on pages.
Author: Benedict Eastaugh
Version: 1.0
Author URI: http://extralogical.net/
*/
 
/**
 * Adds a class of 'page' to the body element when on a page, and a class of
 * 'single' when on a single post page.
 *
 * @param array $classes
 * @return array $classes
 */
function add_page_class_to_body($classes) {
	if (is_page()) $classes[] = 'page';
	if (is_single()) $classes[] = 'single';
	return $classes;
}
 
add_filter('tarski_bodyclass', 'add_page_class_to_body');
 
?>