and add `dropdown-menu` class. * * @param String $output See link. * @param Int $depth See link. * @param Array $args See link. * @return void */ public function start_lvl( &$output, $depth = 0, $args = array() ) { if ( 'primary' === $args->theme_location ) { $indent = str_repeat( "\t", $depth ); $output .= sprintf( '%2$s

%3$s', "\n", $indent, "\n" ); } } }