サンプル
<!DOCTYPE html>
<html lang="jp">
<head>
<meta charset="utf-8">
<title>Bootstrap 101 Template</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Bootstrap -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" integrity="sha512-dTfge/zgoMYpP7QbHy4gWMEGsbsdZeCXz7irItjcC3sPUFtf0kuFbDz/ixG7ArTxmDjLXDmezHubeNikyKGVyQ==" crossorigin="anonymous">
</head>
<body>
<!-- アイコン -->
<i class="glyphicon glyphicon-envelope"></i>
<i class="glyphicon glyphicon-trash"></i>
<!-- ボタン -->
<a class="btn" href="#">Default</a>
<a class="btn btn-primary" href="#">Primary</a>
<a class="btn btn-info" href="#"><i class="glyphicon glyphicon-info-sign"></i> Info</a>
<div class="btn-group">
<a class="btn btn-success" href="#">Success</a>
<a class="btn btn-warning" href="#">Warning</a>
<a class="btn btn-danger" href="#">Danger</a>
</div>
<script src="http://code.jquery.com/jquery.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js" integrity="sha512-K1qjQ+NcF2TYO/eI3M6v8EiNYZfA95pQumfvcVrTHtwQVDG+aHRqLi/ETn2uB+1JqwYqVG3LIvdm9lj6imS/pQ==" crossorigin="anonymous"></script>
</body>
</html>