navigation bar is not displaying, after upgrading content css
<nav class="navbar navbar-inserse">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggler" data-toggle="collapse" data-target="#mynavbar">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">CB Funtion</a>
<div class="collapsing navbar-collapse" id="myNavbar">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">About</a></li>
<li><a href="#">Contect</a></li>
<li><a href="#">Blog</a></li>
<li><a href="#">Prodect</a></li>
</ul>
<ul class="nav navbar-nav navbar-light">
<li><a href="#"><span class="glyphicon glyphicon-log-in"></span>Login</a></li>
</ul>
</div>
</div>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css">
<script src="https://cdn.jsdelivr.net/npm/jquery@3.6.1/dist/jquery.slim.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/js/bootstrap.bundle.min.js"></script>