BUY ME
Here is a link example:

<a href="#" class="button">BUY ME</a>

Here is the Style:

<style type="text/css">
<!--
a.button {
display: block;
font-family:Verdana, Geneva, sans-serif;
border: 1px solid;
border-color: #aaa #000 #000 #aaa;
width: 6em;
padding: 3px;
background: #F90;
color: #fff;
text-decoration:none;
text-align:center;
font-weight:bold;
}

a.button:hover {
position: relative;
top: 1px;
left: 1px;
border-color: #000 #aaa #aaa #000;
background: #3F9;
color: #000;
}-->
</style>