Edit in JSFiddle

<ul>
    <li><a href="#">Home</a></li><li><a href="#">Careers</a></li><li><a href="#">About</a></li><li><a href="#">Contact</a></li>
</ul>
ul { margin-top: 10px; text-align: center; }
li { display: inline-block; list-style: none; padding: 5px 0; margin-left: 5px; }
li:first-child { margin-left: 0; }
li { 
    background: #82B5DA; 
    border: 1px solid #599CCE; 
    border-radius: 3px; 
    box-shadow: 0 0 3px rgba(0,0,0,0.3); 
    padding: 5px; color: #333; 
}
li:hover { background: #599CCE; }
li a { color: #333; text-decoration: none; text-shadow: 1px 1px 0 rgba(255,255,255,0.3); }

/* IE7 Hack - http://www.brunildo.org/test/InlineBlockLayout.html */
li { *display: inline; zoom: 1; }