<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/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 rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"> <div class="container"> <div class="row"> <a href="#" data-toggle="tooltip" data-placement="top" title="Shortlist"><i class="fas fa-heart"></i> Shortlist</a> </div> </div> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>

a { margin:50px auto; } .tooltip.top .tooltip-inner { background-color:#000; padding:5px 20px; opacity:0.5; border-radius:0; border-top:1px solid red; } .tooltip.top .tooltip-arrow { border-top-color:#000; opacity:0.5; }

$(document).ready(function(){ $('[data-toggle="tooltip"]').tooltip(); });