<style>
        
        nav  {
            display: block;
            width: 100%;
            overflow: hidden;
        }
        
        nav ul {
            margin: 80px 0 20px 0;
            padding: .7em;
            float: left;
            list-style: none;
            background: #444;
            background: rgba(0,0,0,.2);
            -moz-border-radius: .5em;
            -webkit-border-radius: .5em;
            border-radius: .5em;    
            -moz-box-shadow: 0 1px 0 rgba(255,255,255,.2), 0 2px 1px rgba(0,0,0,.8) inset;
            -webkit-box-shadow: 0 1px 0 rgba(255,255,255,.2), 0 2px 1px rgba(0,0,0,.8) inset;
            box-shadow: 0 1px 0 rgba(255,255,255,.2), 0 2px 1px rgba(0,0,0,.8) inset; 
        }
        
        nav li {
            float:left;
        }
        
        nav a {
            float:left;
            padding: .8em 1.5em;
            text-decoration: none;
            color: #555;
            text-shadow: 0 1px 0 rgba(255,255,255,.5);
            font: bold 1.1em/1 'trebuchet MS', Arial, Helvetica;
            letter-spacing: 1px;
            text-transform: uppercase;
            border-width: 1px;
            border-style: solid;
            border-color: #fff #ccc #999 #eee;
            background: #c1c1c1;
            background: -moz-linear-gradient(#f5f5f5, #c1c1c1);
            background: -webkit-gradient(linear, left top, left bottom, from(#f5f5f5), to(#c1c1c1));
            background: -webkit-linear-gradient(#f5f5f5, #c1c1c1);
            background: -o-linear-gradient(#f5f5f5, #c1c1c1);
            background: -ms-linear-gradient(#f5f5f5, #c1c1c1);
            background: linear-gradient(#f5f5f5, #c1c1c1);            
         }
         
        nav a:hover, nav a:focus {
            outline: 0;
            color: #fff;
            text-shadow: 0 1px 0 rgba(0,0,0,.2);
            background: #fac754;
            background: -moz-linear-gradient(#fac754, #f8ac00);
            background: -webkit-gradient(linear, left top, left bottom, from(#fac754), to(#f8ac00));
            background: -webkit-linear-gradient(#fac754, #f8ac00);
            background: -o-linear-gradient(#fac754, #f8ac00);
            background: -ms-linear-gradient(#fac754, #f8ac00);
            background: linear-gradient(#fac754, #f8ac00);
        }
        
        nav a:active {
            -moz-box-shadow: 0 0 2px 2px rgba(0,0,0,.3) inset;
            -webkit-box-shadow: 0 0 2px 2px rgba(0,0,0,.3) inset;
            box-shadow: 0 0 2px 2px rgba(0,0,0,.3) inset;
        }
         
        nav li:first-child a {
            border-left: 0;
            -moz-border-radius: 4px 0 0 4px;
            -webkit-border-radius: 4px 0 0 4px;
            border-radius: 4px 0 0 4px;            
        }
        
        nav li:last-child a {
            border-right: 0;
            -moz-border-radius: 0 4px 4px 0;
            -webkit-border-radius: 0 4px 4px 0;
            border-radius: 0 4px 4px 0;            
        }
        
        /*----------------------*/
        
        #about
        {
            color: #999;
            text-align: center;
        }
        
        #about a
        {
            color: #eee;
        } 
    </style>

<nav>
    <ul>
        <li><a href="">Home</a></li>
        <li><a href="">Categories</a></li>
        <li><a href="">About</a></li>        
        <li><a href="">Portfolio</a></li>
        <li><a href="">Contact</a></li>
    </ul>
</nav>