<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>
<nav class="menum navbar navbar-light navbar-expand-md justify-content-center fixed-top">
<div class="container">
<div class="navbar-collapse collapse justify-content-between align-items-center w-100" id="collapsingNavbar2">
<ul class="topBotomBordersOut navbar-nav mx-auto text-center">
<li class="nav-item active">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item"><a class="nav-link" href="#">About</a></li>
<li class="nav-item"> <a class="nav-link" href="#">Services</a>
<li class="nav-item"> <a class="nav-link" href="#">Portfolio</a>
<li class="nav-item"> <a class="nav-link" href="#">Blog</a>
<li class="nav-item"> <a class="nav-link" href="#">Contact</a>
</li>
</ul>
</div>
</div>
</nav>