<link href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<a href="#" class="link">My link1</a>
<a href="#" class="link">My link2</a>
.link {
color: #333333;
text-decoration: none;
-o-transition: all 0.5s linear;
-moz-transition: all 0.5s linear;
-khtml-transition: all 0.5s linear;
-webkit-transition: all 0.5s linear;
-ms-transition: all 0.5s linear;
transition: all 0.5s linear;
}
.link:hover {
color: #b50000;
text-decoration: underline;
opacity: 0.4;
}