<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/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="https://codenullscript.com" rel="dofollow" target="Blank">Click Here For More Examples</a> <br> <br> <button type="button" class="btn btn-default btn-circle"><i class="glyphicon glyphicon-user"></i></button> <button type="button" class="btn btn-primary btn-circle"><i class="glyphicon glyphicon-book"></i></button> <button type="button" class="btn btn-success btn-circle"><i class="glyphicon glyphicon-home"></i></button> <button type="button" class="btn btn-info btn-circle"><i class="glyphicon glyphicon-file"></i></button> <button type="button" class="btn btn-warning btn-circle"><i class="glyphicon glyphicon-remove"></i></button> <button type="button" class="btn btn-danger btn-circle"><i class="glyphicon glyphicon-plane"></i></button>