JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="menu">
  <li><a href="#">Home</a></li>
  <li><a href="#">Work</a>
      <ul>
           <li><a href="#">CSS Development</a></li>
           <li><a href="#">Graphic Design</a></li>
           <li><a href="#">Development Tools</a></li>
           <li><a href="#">Web Design</a></li>
      </ul>
  </li>
  <li><a href="#">About</a></li>
  <li><a href="#">Contact Us</a></li>
  <li style="float: right;"><a href="#">Feedback</a></li>
</ul>

CSS

/* Main */
#menu{
	width: 100%;
	margin: 0;
	padding: 10px 0 0 0;
	list-style: none;  
	background: #111;
	background: -moz-linear-gradient(#444, #111); 
        background: -webkit-gradient(linear,left bottom,left top,color-stop(0, #111),color-stop(1, #444));	
	background: -webkit-linear-gradient(#444, #111);	
	background: -o-linear-gradient(#444, #111);
	background: -ms-linear-gradient(#444, #111);
	background: linear-gradient(#444, #111);
	-moz-border-radius: 50px;
	border-radius: 50px;
	-moz-box-shadow: 0 2px 1px #9c9c9c;
	-webkit-box-shadow: 0 2px 1px #9c9c9c;
	box-shadow: 0 2px 1px #9c9c9c;
}

#menu li{
	float: left;
	padding: 0 0 10px 0;
	position: relative;
}

#menu a{
	float: left;
	height: 25px;
	padding: 0 25px;
	color: #999;
	text-transform: uppercase;
	font: bold 12px/25px Arial, Helvetica;
	text-decoration: none;
	text-shadow: 0 1px 0 #000;
}

#menu li:hover > a{
	color: #fafafa;
}

*html #menu li a:hover{ /* IE6 */
	color: #fafafa;
}

#menu li:hover > ul{
	display: block;
}

/* Sub-menu */

#menu ul{
    list-style: none;
    margin: 0;
    padding: 0;    
    display: none;
    position: absolute;
    top: 35px;
    left: 0;
    z-index: 99999;    
    background: #444;
    background: -moz-linear-gradient(#444, #111);
    background: -webkit-gradient(linear,left bottom,left top,color-stop(0, #111),color-stop(1, #444));
    background: -webkit-linear-gradient(#444, #111);    
    background: -o-linear-gradient(#444, #111);	
    background: -ms-linear-gradient(#444, #111);	
    background: linear-gradient(#444, #111);	
    -moz-border-radius: 5px;
    border-radius: 5px;
}

#menu ul li{
    float: none;
    margin: 0;
    padding: 0;
    display: block;  
    -moz-box-shadow: 0 1px 0 #111111, 0 2px 0 #777777;
    -webkit-box-shadow: 0 1px 0 #111111, 0 2px 0 #777777;
    box-shadow: 0 1px 0 #111111, 0 2px 0 #777777;
}

#menu ul li:last-child{   
    -moz-box-shadow: none;
    -webkit-box-shadow: none;
    box-shadow: none;    
}

#menu ul a{    
   ...