Center the whole menu?

Hello,

I’m making a website http://www.beritmoller.com and I want to center the whole menu, how can I do this?

I want the menu like this webpage http://www.wrede.se

Please help me!

Right now I’ve put this in the CSS:

#mega-menu-wrap-primary-2 {
width: 90%;
margin: 0 5% 0 5%;
}

But it’s not centered as you can see on my website http://www.beritmoller.se

https://wordpress.org/plugins/megamenu/