p            { font-family:Arial }
a            { text-decoration:none; font-family:Arial }
a:link       { color: #000000 }
a:visited    { color: #000000 }
a:hover      {
	text-decoration:underline;
	font-weight: bold;
}
a:active     { text-decoration:underline }
<div id="menu">
<li><a href="index.html">Accueil</a></li>
<li id="encours">Bio</li>
<li><a href="video.html">Page 3</a></li>
</ul>
</div>