I have added a simple dropdown using the following code -:
<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/3.5.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
<nav class="nav-menu d-none d-lg-block">
<ul>
<li class="active"><a href="#header">Dashboard</a></li>
<li class="dropdown"><a href="#"><span>Drop Down</span> <i class="bi bi-chevron-down"></i></a>
<ul>
<li><a href="#">Drop Down 1</a></li>
<li><a href="#">Drop Down 2</a></li>
<li><a href="#">Drop Down 3</a></li>
</ul>
</li>
</ul>
</nav>
And also added the following libraries :-
<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/3.5.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
But my dropdown is not working. It is showing all the options 1 after the other like this :-
