How can I add class to wp_nav_menu?

Question

I have 2 menu. How can I add class to a href for 'header_menu'? Thanks

function register_menus() {
    register_nav_menus(
        array(
            'header_menu'      => 'Header menu',
            'header_menu_page' => 'Menu Page'           

        )
    );
}
}
add_action( 'after_setup_theme', 'register_menus' );

Answer 1

You can directly call a class in header menu.

function register_menus() {
    register_nav_menus(
        array(
            'header_menu'      => '<div class="ClassName"'.'Header menu'.'</div>',
            'header_menu_page' => 'Menu Page'           

        )
    );
}
}
add_action( 'after_setup_theme', 'register_menus' );