Alec is right - modifying this means you will affect all pages using this module if you have it set in the skin file.
Here's how I do it. The Links module is managed by the CommandButton link and so to create the cool hover affect, I added this to the css file.
A.CommandButton, A.CommandButton:link, A.CommandButton:visited
{text-decoration: none;
font-family: Verdana, Tahoma, Arial, Helvetica;
font-size: 10px;
color: #1D6CE3;
background-color: fafafa;
border: 1px solid #cccccc;
height: 20px;
padding-top: 3px;
padding-bottom: 3px;
padding-left: 3px;
padding-right: 3px;}
A.CommandButton:hover
{text-decoration: none;
font-family: Verdana, Tahoma, Arial, Helvetica;
font-size: 10px;;
color:#CC0505;
background-color: fafafa;
border: 1px solid #1D6CE3;
height: 20px;
padding-top: 3px;
padding-bottom: 3px;
padding-left: 3px;
padding-right: 3px;}
That will give you boxes and mouse over affects on your skin like it has been done here..
Nina Meiers
My Site - My Blogs - Goodies - 28 Free DNNSkins - Nina's Free Skins