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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/3.7.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script></head><body><div class="container"> <h3>Pills With Dropdown Menu</h3> <ul class="nav nav-pills nav-stacked"> <li class="active"><a href="#">Home</a></li> <li class="dropdown"> <a class="dropdown-toggle" data-toggle="dropdown" href="#">Menu 1 <span class="caret"></span></a> <ul class="dropdown-menu"> <li><a href="#">Submenu 1-1</a></li> <li><a href="#">Submenu 1-2</a></li> <li><a href="#">Submenu 1-3</a></li> </ul> </li> <li><a href="#">Menu 2</a></li> <li><a href="#">Menu 3</a></li> </ul></div>