Menu not styling. New menus functionality giving me a headache

This: 

<nav>
    <?php wp_nav_menu( array( 'theme_location' => 'main-menu' ) ); ?>
</nav>

.

Should be: 

<nav>
<?php wp_nav_menu( array( 'theme_location' => 'main-menu', 'menu_class' => 'main_menu' ) ); ?>
</nav>

The css:

.main_menu {
   font-size: 14px; // example
}

.

Learn more here: wp_nav_menu

Best of luck,
Sagive

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