<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script> <script src="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="container"> <div class="row"> <div class="col-md-6"> <div class="panel with-nav-tabs panel-default"> <div class="panel-heading"> <ul class="nav nav-tabs"> <li class="active"><a href="#tab1default" data-toggle="tab">Default 1</a></li> <li><a href="#tab2default" data-toggle="tab">Default 2</a></li> <li><a href="#tab3default" data-toggle="tab">Default 3</a></li> <li class="dropdown"> <a href="#" data-toggle="dropdown">Dropdown <span class="caret"></span></a> <ul class="dropdown-menu" role="menu"> <li><a href="#tab4default" data-toggle="tab">Default 4</a></li> <li><a href="#tab5default" data-toggle="tab">Default 5</a></li> </ul> </li> </ul> </div> <div class="panel-body"> <div class="tab-content"> <div class="tab-pane fade in active" id="tab1default">Default 1</div> <div class="tab-pane fade" id="tab2default">Default 2</div> <div class="tab-pane fade" id="tab3default">Default 3</div> <div class="tab-pane fade" id="tab4default">Default 4</div> <div class="tab-pane fade" id="tab5default">Default 5</div> </div> </div> </div> </div> </div> </div>

.nav-tabs li a:before{ content: ''; position: absolute; left: -18px; bottom: 0; width: 0; height: 0; border-style: solid; border-width: 0 0 38px 20px; border-color: transparent transparent #007bff transparent; } .nav-tabs li a:after{ content: ''; position: absolute; right: -18px; bottom: 0; width: 0; height: 0; border-style: solid; border-width: 38px 0 0 20px; border-color: transparent transparent transparent #007bff; } .nav-tabs>li { margin-right: 22px; } .nav-tabs>li.active>a, .nav-tabs>li.active>a:hover, .nav-tabs>li.active>a:focus { border-radius: 10px 10px 0 0; }