', esc_url( get_bloginfo( 'pingback_url' ) ) ); } } add_action( 'wp_head', 'buzz_agency_pingback_header' ); function buzz_agency_add_class_next_post_link($html){ $html = str_replace('rel="next">','class="box-button" rel="next">',$html); return $html; } add_filter('next_post_link','buzz_agency_add_class_next_post_link',10,1); function buzz_agency_add_class_previous_post_link($html){ $html = str_replace('rel="prev">','class="box-button" rel="next">',$html); return $html; } add_filter('previous_post_link','buzz_agency_add_class_previous_post_link',10 ,1);