Add WordPress slug to body class

functions.php

<?php
// don't copy php tag

//* Slug as body class
function body_class_slug( $classes ) {
	global $post;
	if ( isset( $post ) ) {
		$classes[] = $post->post_name;
	}
	return $classes;
}
add_filter( 'body_class', 'body_class_slug');