Centering a menu css

Hello,
I’ve got a strange problem.

I can’t center a menu in wordpress. I can’t believe it!!!

Here is the code:

<nav>
    <div id="nav">
	<div class="menu-english-container">
           <ul id="menu-english" class="menu">
               <li id="menu-item-375" class="menu-item menu-item-type-post_type menu-item-object-page current-menu-item page_item page-item-5 current_page_item menu-item-375">
                   <a href="http://chateaucazine.com/">Menu 1</a>
               </li>
               <li id="menu-item-375" class="menu-item menu-item-type-post_type menu-item-object-page current-menu-item page_item page-item-5 current_page_item menu-item-375">
                   <a href="http://chateaucazine.com/">Menu 2</a>
               </li>
               <li id="menu-item-375" class="menu-item menu-item-type-post_type menu-item-object-page current-menu-item page_item page-item-5 current_page_item menu-item-375">
                   <a href="http://chateaucazine.com/">Menu 3</a>
               </li>
    </ul>
</div>
</div>
</nav>

Here’s my css:

[CSS code above the forum limit of 10 lines moderated – just post a link to your site]

Please help me because I’m going crazy with it!!!