Prova con questo codice:

<html>

<head>
<title>prova</title>
<style>
a {color: #f60; text-decoration:none;background: #9cf;font-weight: bold;}
a:link { color:#f60; text-decoration: none;}
a:visited { color:#ff4e00; text-decoration:none;}
a:hover {color:#9cf; background: #f60;font-weight:bold;}
</style>
</head>

<body>
Invia
</body>

</html>

Ciao