To add a background color, you set it within the "a" state. A color is also added to make the text readable. At this stage there is no rollover state. This will be added soon.
Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.
CSS CODE
ul#navigation
{
list-style-type: none;
margin: 0;
padding: .5em 0;
border-top: 1px solid #666;
}
ul#navigation li a
{
display: block;
width: 5em;
color: #FFF;
background-color: #036;
}
ul#navigation .left { float: left; }
ul#navigation .right { float: right; }
HTML CODE
<p>
Lorem ipsum dolor sit amet...
</p>
<ul id="navigation">
<li class="left"><a href="#">Back</a></li>
<li class="right"><a href="#">Next</a></li>
</ul>