非常简单定制响应CSS3下拉风格菜单

非常简单容易定制响应CSS3下拉风格菜单。
HTML5
<nav>
   <ul>
     <li><a href="http://www.creativeverse.com" target="_parent">Back To Creative Verse</a></li>
     <li><a href="#">Portfolio</a>
       <ul>
         <li><a href="#">Photoshop</a></li>
         <li><a href="#">Illustrator</a></li>
         <li><a href="#">Web Design</a>
           <ul>
             <li><a href="#">Test 1</a></li>
             <li><a href="#">Test 2</a></li>
           </ul>
         </li>
       </ul>
     </li>
     <li><a href="#">Blog</a></li>
     <li><a href="#">About Us</a></li>
     <li><a href="#">Contact Us</a></li>
   </ul>
 </nav>
CSS3
a { /* Gives Nice And Fast Transition Effect Typically For Flat Designs */
    -webkit-transition: all 0.3s ease-in;
    -moz-transition: all 0.3s ease-in;
    -o-transition: all 0.3s ease-in;
}
nav ul ul {
    display: none;
}
nav ul li:hover > ul {
    display: block;
}
nav {
    margin: 20px auto 0 auto;
    max-width: 920px;
}
nav a {
    font-size: 14px;
    color: #FFF;
    text-decoration: none;
    font-family: Arial, Helvetica, sans-serif;
    padding: 23px 50px 23px 25px;
    display: block;
    background: #1abc9c;
}
nav a:hover {
 color:;
    background: #16a085;
}
nav ul {
    position: relative;
    display: inline-table;
}
nav ul:after {
    content: "";
    clear: both;
    display: block;
}
nav ul li {
    float: left;
}
nav ul ul {
    position: absolute;
    top: 100%;
}
nav ul ul li {
    float: none;
    position: relative;
}
nav ul ul li a {
    color: #fff;
    min-width: 100px;
}
nav ul ul li a:hover {
    background: #4b545f;
    padding: 23px 50px 23px 25px;
}
nav ul ul ul {
    position: absolute;
    left: 100%;
    top: 0;
    min-width: 150px;
}