artman1988 on "CSS styling for search menu added to nav menu"

Hi,
In my twenty twelve theme I added the search form to my nav menu by adding the code below to my functions.php file:

// add search to menu bar
add_filter('wp_nav_menu_items','add_search_box', 10, 2);
function add_search_box($items, $args) {

        ob_start();
        get_search_form();
        $searchform = ob_get_contents();
        ob_end_clean();

	if( $args->theme_location == 'primary' )
        return $items .= '<li>' . $searchform . '</li>';

    return $items;
}

You can see the site here: website

What I want to do is modify the search form with css styling - mainly having the menu aligned to the right of the nav menu.
I am not sure what ID to use for the css styling. Or should I create a new css class? If so, what do I name it

My first guess was to use an ID of "searchform", but that didn't work so well.

Thanks for your help.