Navbar is not showing up on mobile - html

Question

<!-- Navbar -->
<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
<div class="container-fluid">
<div class="collapse navbar-collapse" id="navbarNav">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link active" aria-current="page" href="index.html">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="`enter code here`">Resume</a>
</li>
<li class="nav-item">
<a class="nav-link" href="">Linkedin</a>
</li>
<li class="nav-item">
<a class="nav-link" href="">GitHub</a>
</li>
<li class="nav-item">
<a class="nav-link" href="">Email</a>
</li>
</ul>
</div>
</div>
</nav>
This is the navbar in html made with BootStrap. but somehow it does not show up on the mobile any tips of how to change this? I have tried a lot and I looked over previous questions aswell but nothing helped

Answer 1

As you can see in the Bootstrap 5 docs...
"Navbars can use .navbar-toggler, .navbar-collapse, and
.navbar-expand{-sm|-md|-lg|-xl|-xxl} classes to determine when their
content collapses behind a button"
Your code is missing the toggler...
<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
<div class="container-fluid">
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav" aria-controls="navbarTogglerDemo01" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link active" aria-current="page" href="index.html">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="`enter code here`">Resume</a>
</li>
<li class="nav-item">
<a class="nav-link" href="">Linkedin</a>
</li>
<li class="nav-item">
<a class="nav-link" href="">GitHub</a>
</li>
<li class="nav-item">
<a class="nav-link" href="">Email</a>
</li>
</ul>
</div>
</div>
</nav>
Demo
Also note the data attributes have changed in Bootstrap 5