<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.8.1/css/all.css" integrity="sha384-50oBUHEmvpQ+1lW4y57PTFmhCaXp0ML5d60M1M7uH2+nqUivzIebhndOJK28anvf" crossorigin="anonymous">
<nav class="navbar navbar-expand-lg navbar-light sticky-top">
<div class="container">
<a class="navbar-brand" href="#">Mega Menu</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#mobile_nav" aria-controls="mobile_nav" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="mobile_nav">
<ul class="navbar-nav mr-auto mt-2 mt-lg-0 float-md-right">
</ul>
<ul class="navbar-nav navbar-light">
<li class="nav-item"><a class="nav-link" href="#">Home</a></li>
<li class="nav-item"><a class="nav-link" href="#">About Us</a></li>
<li class="nav-item dmenu dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Services
</a>
<div class="dropdown-menu sm-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Software Development</a>
<a class="dropdown-item" href="#">Web Designing & Development</a>
<a class="dropdown-item" href="#">Mobile Application</a>
<a class="dropdown-item" href="#">Business Solutions & Business Process</a>
<a class="dropdown-item" href="#">Digital Marketing & SEO Services</a>
<a class="dropdown-item" href="#">Web Hosting & Maintenance</a>
<a class="dropdown-item" href="#">Cyber Security</a>
<a class="dropdown-item" href="#">Block Chain Implementation</a>