a:link { 
color: white; 
background-color: black;
text-decoration: none;
border: 2px solid white; 
}
a:visited { 
color: white; 
background-color: black;
text-decoration: none;
border: 2px solid white; 
}
a:hover {
color: blue; 
background-color: white;
text-decoration: underline;
border: 2px solid black; 
}