WordPress: Add user role class to body tag

wp-role-bodyclass.php

<?php

// Add role class to body
function add_role_to_body($classes) {   
    foreach (wp_get_current_user()->roles as $user_role) {
        $classes[] = 'role-'. $user_role;
    }
    return $classes;
});
add_filter('body_class','add_role_to_body');
add_filter('admin_body_class', 'add_role_to_body');

?>