Pure CSS Dropdown Menu

http://line25.com/tutorials/how-to-create-a-pure-css-dropdown-menu

by Hari Menon

HTML

<div>
    <nav>
        <ul>
            <li><a href="#">Home</a></li>
            <li><a href="#">Tutorials</a>
                <ul>
                    <li><a href="#">Photoshop</a></li>
                    <li><a href="#">Illustrator</a></li>
                    <li><a href="#">Web Design</a>
                        <ul>
                            <li><a href="#">HTML</a></li>
                            <li><a href="#">CSS</a></li>
                        </ul>
                    </li>
                </ul>
            </li>
            <li><a href="#">Articles</a>
                <ul>
                    <li><a href="#">Web Design</a></li>
                    <li><a href="#">User Experience</a></li>
                </ul>
            </li>
            <li><a href="#">Inspiration</a></li>
        </ul>
    </nav> 
</div>
<div><span>Thanks to <a href="http://line25.com/tutorials/how-to-create-a-pure-css-dropdown-menu">Chris Spooner</a></span></div>

CSS

div{
    padding: 30px;
}
nav ul ul {
    display: none;
}
nav ul li:hover > ul {
    display: block;
}
nav ul {
    background: #efefef;
    background: linear-gradient(top, #efefef 0%, #bbbbbb 100%);
    background: -moz-linear-gradient(top, #efefef 0%, #bbbbbb 100%);
    background: -webkit-linear-gradient(top, #efefef 0%, #bbbbbb 100%);
    box-shadow: 0px 0px 9px rgba(0, 0, 0, 0.15);
    padding: 0 30px;
    border-radius: 10px;
    list-style: none;
    position: relative;
    display: inline-block;
}
nav ul:after {
    content:"";
    clear: both;
    display: block;
}
nav ul li {
    float: left;
}
nav ul li:hover {
    background: #4b545f;
    background: linear-gradient(top, #4f5964 0%, #5f6975 40%);
    background: -moz-linear-gradient(top, #4f5964 0%, #5f6975 40%);
    background: -webkit-linear-gradient(top, #4f5964 0%, #5f6975 40%);
}
nav ul li:hover a {
    color: #fff;
}
nav ul li a {
    display: block;
    padding: 15px 30px;
    color: #757575;
    text-decoration: none;
}
nav ul ul {
    background: #5f6975;
    border-radius: 0px;
    padding: 0;
    position: absolute;
    top: 100%;
}
nav ul ul li {
    float: none;
    border-top: 1px solid #6b727c;
    border-bottom: 1px solid #575f6a;
    position: relative;
}
nav ul ul li a {
    padding: 15px 40px;
    color: #fff;
}
nav ul ul li a:hover {
    background: #4b545f;
}
nav ul ul ul {
    position: absolute;
    left: 100%;
    top:0;
}