navigation bar css template
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
Use the link above in your code, between head, for bootstrap because the
code below is used with bootstrap.
Change the names and links to whatever you want, but don't change the
class just make a custom class within that.
<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
<a class="navbar-brand" href="">Brand name</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse"id="navbarSupportedContent">
<ul class="navbar-nav ml-auto">
<li class="nav-item">
<a class="nav-link" href="#top">TOP</a>
</li>
<li>
<a class="nav-link" href="#middle">MIDDLE</a>
</li>
<li>
<a class="nav-link" href="#bottom">BOTTOM</a>
</li>
</ul>
</nav>