How to make head of dropdown link clickable in navbar?

Question

My navbar is this, i searched a lot and tried stuff but i can't find a solution. Can anyone help?

<nav class="navbar navbar-expand-lg navbar-dark bg-dark static-top">
<div class="container">
<a class="navbar-brand" href="#">
<img src="1.png" width=100px; alt="">
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarResponsive">
<ul class="navbar-nav ml-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home
<span class="sr-only">(current)</span>
</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle " href="#" id="navbardrop" data-toggle="dropdown">
About Us
</a>
<div class="dropdown-menu">
<a class="dropdown-item" href="whoweare.html">Who we are</a>
<a class="dropdown-item" href="programs.html">Programs</a>
<a class="dropdown-item" href="meetus.html">Meet Us</a>
<a class="dropdown-item" href="gallery.html">Our Gallery</a>
</div>
</li>

<li class="nav-item">
<a class="nav-link" href="events.html">Events</a>
</li>
<li class="nav-item">
<a class="nav-link" href="donate.html">Donate</a>
</li>
<li class="nav-item">
<a class="nav-link" href="contact.html">Contact Us</a>
</li>
</ul>
</div>
</div>
</nav><br>

Answer 1

Are you using some CSS framework or have your own custom CSS definition? cause I see you use a lot of classes which are nowhere defined in the snippet.

Answer 2

I use Bootstrap framework if i understand right the question