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<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="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script> <style> .affix { top: 20px; } </style></head><body><div class="container-fluid" style="background-color:#2196F3;color:#fff;height:200px;"> <h1>Bootstrap affixed.bs.affix</h1> <p>Scroll down this page.</p> <p><strong>The affixed.bs.affix event occurs when the .affix-top class has been replaced with the .affix class.</strong></p></div><br><div class="container"> <div class="row"> <nav class="col-sm-3"> <ul class="nav nav-pills nav-stacked">