Finally, I managed my HTML and yours.
There’re a lot of changes in Bootstrap 4 in compare to version 3. Regarding your markup, you have to change:
- “Navbar-inverse” to “Navbar-dark” and use color “bg-dark”.
- Add few attributes to button, as “aria-controls”, “aria-expanded”, “aria-label” and “data-target” for link to another element.
- Property “id” to collapsable element.
- For list elements (tag LI) should be added class=”nav-item”
- For links unside list elements add class=”nav-link”.
- I suggest to add “mr-auto” to list definiton.
All changes below. Tested here.
<nav class="navbar navbar-expand-sm navbar-dark fixed-top bg-dark">
<div class="container">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
</button>
<a class="navbar-brand" href="https://stackoverflow.com/">Application name</a>
<div class="navbar-collapse collapse" id="navbarSupportedContent">
<ul class="nav navbar-nav mr-auto">
<li class="nav-item"><a href="https://stackoverflow.com/" class="nav-link">Home</a></li>
<li class="nav-item"><a href="http://stackoverflow.com/Home/About" class="nav-link">About</a></li>
<li class="nav-item"><a href="http://stackoverflow.com/Home/Contact" class="nav-link">Contact</a></li>
</ul>
<ul class="nav navbar-nav navbar-right mr-auto">
<li class="nav-item"><a href="http://stackoverflow.com/Account/Register" id="registerLink" class="nav-link">Register</a></li>
<li class="nav-item"><a href="http://stackoverflow.com/Account/Login" id="loginLink" class="nav-link">Log in</a></li>
</ul>
</div>
</div>
</nav>