Tryit Editor v2.9

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<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
  <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
  <style>
  /* Popover */
  .popover {
      border: 2px dotted red;
  }
  /* Popover Header */
  .popover-title {
      background-color: #73AD21; 
      color: #FFFFFF; 
      font-size: 28px;
      text-align:center;
  }
  /* Popover Body */
  .popover-content {
      background-color: coral;
      color: #FFFFFF;
      padding: 25px;
  }
  /* Popover Arrow */
  .arrow {
      border-right-color: red !important;
  }
  </style>
</head>
<body>

<div class="container">
  <h3>Popover CSS Example</h3>
  <a href="tryit.asp-filename=trybs_ref_js_popover_css&stacked=h.html#" data-toggle="popover" title="Popover Header" data-content="Some content inside the popover">Toggle popover</a>
</div>

<script>
$(document).ready(function(){
    $('[data-toggle="popover"]').popover();   
});
</script>

</body>
</html>