How to get the secondary menu to look like the main menu

Hello.
So i built a regular second menu in Enfold.
I wanted to display it directly above the main menu and keep the mega – menu behaviour of enfold.

In my functions.php i added a shortcode:

function print_menu_shortcode($atts, $content = null) {
	extract(shortcode_atts(array( 'name' => null, 'class' => null ), $atts));
	return wp_nav_menu( array( 'menu' => $name, 'menu_class' => 'menu', 'echo' => false ) );
}
add_shortcode('menu', 'print_menu_shortcode');

and in approx. line 157 of ‘helper-main-menu.php’ added the code:
$output .= do_shortcode('[menu name="secondary-menu" menu_class="mysecondarymenu"]');

The secondary menu shows up, but expanded with all the menu and submenu entries directly visible.

What CSS markup do i have to add, so that the mega-menu behavior will be appended to the secondary menu?

Or is my approach not the right one?

if that is possible at all.