add css class name to wordpress menu and acf options page

// add nav menu class & sub-menu class

function v123_nav_class($classes, $item)
{
	if (in_array('menu-item-has-children', $classes)) {
		$classes[] = 'dropdown';
	}
	return $classes;
}
add_filter('nav_menu_css_class', 'v123_nav_class', 10, 2);

function my_nav_menu_submenu_css_class($classes)
{
	$classes[] = 'dropdown-menu';
	return $classes;
}
add_filter('nav_menu_submenu_css_class', 'my_nav_menu_submenu_css_class');

// acf option page
if (function_exists('acf_add_options_page')) {
	acf_add_options_page();
}