Example code of how CSS matches multiple classes

<li id="menu_268098" title="Account Information Query" class="open">
        <li id="menu_270008" class="nav_sec" title="Account Balance Query">
            <a href="#/p/payment.search.account_balance" class="dropdown-toggle">
                <span class="nav-title">Account Balance Inquiry</span>
            </a>
        </li>
    </ul>
</li>

<li id="menu_268098" title="Account Information Query" class="open active">
        <li id="menu_270008" class="nav_sec" title="Account Balance Query">
            <a href="#/p/payment.search.account_balance" class="dropdown-toggle">
                <span class="nav-title">Account Balance Inquiry</span>
            </a>
        </li>
    </ul>
</li>

li.open.active{
  background-color: #fff;
}