wordpress nav_menu with classes

 <nav class="menu-main-container"><ul id="menu-main" class="menu"><li  class="yellow menu-item menu-item-type-post_type menu-item-object-page"><a href="http://uli.kyle-hamilton.com/?page_id=2">Volunteer</a></li>
<li  class="green menu-item menu-item-type-post_type menu-item-object-page"><a href="http://uli.kyle-hamilton.com/?page_id=2">Donate</a></li>
<li  class="blue menu-item menu-item-type-post_type menu-item-object-page"><a href="http://uli.kyle-hamilton.com/?page_id=2">Activities</a></li>
<li  class="darkblue menu-item menu-item-type-post_type menu-item-object-page"><a href="http://uli.kyle-hamilton.com/?page_id=2">Gallery</a></li>
<li  class="pink menu-item menu-item-type-post_type menu-item-object-page"><a href="http://uli.kyle-hamilton.com/?page_id=2">Partners</a></li>
<li  class="purple menu-item menu-item-type-post_type menu-item-object-page"><a href="http://uli.kyle-hamilton.com/?page_id=2">About Us</a>
<ul class="sub-menu">
    <li  class="menu-item menu-item-type-post_type menu-item-object-page"><a href="http://uli.kyle-hamilton.com/?page_id=2"></a></li>
    <li  class="menu-item menu-item-type-post_type menu-item-object-page"><a href="http://uli.kyle-hamilton.com/?page_id=2">Sample Page</a></li>
    <li  class="menu-item menu-item-type-post_type menu-item-object-page"><a href="http://uli.kyle-hamilton.com/?page_id=2">Sample Page</a></li>
</ul>
</li>
<li  class="orange menu-item menu-item-type-post_type menu-item-object-page"><a href="http://uli.kyle-hamilton.com/?page_id=2">Contact Us</a></li>
</ul></nav>