<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 ----------> <div class="container"> <div class="row"> <a href="#" class="close"> </div> </div>

.close { position: absolute; right: 32px; top: 32px; width: 32px; height: 32px; opacity: 0.3; } .close:hover { opacity: 1; } .close:before, .close:after { position: absolute; left: 15px; content: ' '; height: 33px; width: 2px; background-color: #333; } .close:before { transform: rotate(45deg); } .close:after { transform: rotate(-45deg); }