menu.php

<nav id="primary-navigation" class="site-navigation primary-navigation" role="navigation">
    <button class="menu-toggle"><?php _e( 'Primary Menu', 'twentyfourteen' ); ?></button>
    <a class="screen-reader-text skip-link" href="#content"><?php _e( 'Skip to content', 'twentyfourteen' ); ?></a>
    <?php wp_nav_menu( array( 'theme_location' => 'primary', 'menu_class' => 'nav-menu' ) ); ?>
</nav>