Remove Wordpress Body Classes
add_filter('body_class','my_class_names');
function my_class_names($classes) {
    return array();
}

add_filter('body_class','my_class_names');
function my_class_names($classes) {
    global $wp_query;

    $arr = array();

    if(is_page()) {
    $page_id = $wp_query->get_queried_object_id();
    $arr[] = 'page-id-' . $page_id;
    }

    if(is_single()) {
    $post_id = $wp_query->get_queried_object_id();
    $arr[] = 'postid-' . $post_id;
    }

    return $arr;
}