public function nav_menu() {
        $args = array(
            'theme_location'    => has_nav_menu( 'primary' ) ? 'primary' : '',
            'menu'              => '',
            'container'         => '',
            'container_class'   => '',
            'container_id'      => '',
            'menu_class'        => '',
            'menu_id'           => '',
            'echo'              => false,
            'before'            => '',
            'after'             => '',
            'link_before'       => '',
            'link_after'        => '',
            'items_wrap'        => '<ul data-breakpoint="800" id="%1$s" class="%2$s">%3$s</ul>',
            'depth'             => 0,
        );

        return wp_nav_menu( $args );
    }