无法从菜单悬停第二个UL

Question

I don't know where I have mistaken, I can't hover 2nd ul for the menu, where is solutions arrow down button, it doesn't stay active, when I hover it. I added mobile_menu class to separate it from other menus, and I can't find where I should put #mobile_menu to get it to work

Here is fiddle

HTML

<div id="mobile_menu">
        <label for="show-menu" class="show-menu lines"></label>
        <input type="checkbox" id="show-menu" role="button">
        <ul id="menu">
            <li><a href="#">Features</a></li>
            <li>
                <a href="#">Solutions ￬</a>
                <ul class="hidden">
                    <li><a href="#">Who We Are</a></li>
                    <li><a href="#">What We Do</a></li>
                </ul>
            </li>
            <li>
                <a href="#">Pricing ￬</a>
                <ul class="hidden">
                    <li><a href="#">Photography</a></li>
                    <li><a href="#">Web & User Interface Design</a></li>
                    <li><a href="#">Illustration</a></li>
                </ul>
            </li>
            <li><a href="#">Resources</a></li>
            <li>
                <a href="#">About ￬</a>
                <ul class="hidden">
                    <li><a href="#">Contact Us</a></li>
                    <li><a href="#">Company</a></li>
                    <li><a href="#">Carrers</a></li> 
                </ul>
             </li>
        </ul>
    </div>

Answer 1

You just have to stabilize the hidden div when its visible and being hover ed.

I have updated your fiddle

/*Display the dropdown on hover*/
#mobile_menu ul li:hover > .hidden{
    display: block; /* make div display on hover*/
}