<nav class=“navbar navbar-toggleable-md navbar-inverse fixed-top bg-inverse”>

<button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
  <span class="navbar-toggler-icon"></span>
</button>
<a class="navbar-brand" href="#">Photography by Rituparna Dey</a>

<div class="collapse navbar-collapse" id="navbarsExampleDefault">
  <ul class="navbar-nav mr-auto">
    <li class="nav-item active">
      <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
    </li>
  </ul>
</div>

</nav>