[Theme: Enough] Problem adding icons to wp_nav_menu

Hello,

I’m having a lot of problem trying to add an icon to each value of the menu with wp_nav_menu(). I’ve tried everything and before I give up, I wanted to see if there was something I was doing wrong.

Here’s the PHP code:
<?php wp_nav_menu(array('container' => 'div', 'menu_class' => 'menu', 'echo' => true)); ?>

And here is the CSS:
[CSS moderated as per the Forum Rules. Please just post a link to your site.]

Thanks for your attention. Have a nice day!

http://ww.wp.xz.cn/extend/themes/enough/