When I view my BS4 site on a mobile device, the dropdown menu does not collapse after I click on an anchor. I understand this may be a feature rather than a fault, but IMO, it is not great UX. I see lots of solutions for BS3.x using JS and Jquery, but cannot find a solution that works with the latest deployment. Any help greatly appreciated!
<head>
<meta charset="UTF-8">
<title>NAV-HELL</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<style media="screen">
.row {padding: 50px; height: 800px; } #corporate, #contact { background-color: red;}
</style>
</head>
<body>
<!-- Navigation -->
<div class="container">
<nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top">
<a class="navbar-brand" href="#">NAV-HELL</a>
<button class="navbar-toggler custom-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse ml-auto" id="navbarNavDropdown">
<ul class="navbar-nav ml-auto">
<!-- tried using data attributes in this link-->
<li class="nav-item">
<a class="nav-link" data-toggle="collapse" data-target=".in" href="#about">About</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#corporate">Corporate</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#approach">Approach</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#contact">Contact</a>
</li>
</ul>
</div>
</nav>
</div>
<div class="row" id="about">
About
</div>
<div class="row" id="corporate">
Corporate
</div>
<div class="row" id="approach">
Approach
</div>
<div class="row" id="contact">
Contact
</div>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</body>
