Having trouble getting the dropdown feature of bootstrap's navbar to work. Even after changing the color to black for visibility, I still can't get the menu options to drop down when clicked. Check out the JSFiddle here.
Below is the code snippet I am using for the navbar:
<nav class="navbar navbar-expand-md topHeader">
<a class="navbar-brand nameHeader">
<h1 class="navbarHeader">David Mitchell Barnett</h1>
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapsibleNavbar" aria-controls="collapsibleNavbar" aria-expanded="false" aria-label="Toggle navigation" style="background-color: black" >
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="collapsibleNavbar">
<ul class="navbar-nav ml-auto">
<li class="nav-item">
<a class="nav-link" href="index.html">
<h3>About</h3>
</a>
</li>
<li class="nav-item">
<a class="nav-link" href="portfolio.html">
<h3>Portfolio</h3>
</a>
</li>
<li class="nav-item">
<a class="nav-link" href="contact.html">
<h3>Contact</h3>
</a>
</li>
</ul>
</div>
</nav>