Bootstrap mobile menu not appearing [duplicate] - html

Question

This question already has answers here:
Bootstrap navbar: nothing is displayed on smaller devices
(1 answer)
Bootstrap 5.0 Hamburger menu icon doesn't show up [duplicate]
(1 answer)
Closed 12 months ago.
Hello I'm using Bootstrap to create a website, however when I try to add the hamburger menu it doesn't appear when I bring the screen size down.
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap#5.1.3/dist/css/bootstrap.min.css" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
<nav class="navbar navbar-expand-lg">
<div class="container-fluid">
<a class="navbar-brand" href="#">Hello world</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#toggleMobileMenu" aria-controls="toggleMobileMenu" aria-expanded="false" aria-lable="Toggle Navigation">
<span class = "navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="toggleMobileMenu">
<ul class="navbar-nav ms-auto">
<li class="nav-item">
<a class="nav-link link-dark" href="#">About us</a>
</li>
<li class="nav-item">
<a class="nav-link link-dark" href="#">Pricing</a>
</li>
<li class="nav-item">
<a class="nav-link link-dark" href="#">Contact</a>
</li>
<li class="nav-item">
<a class="nav-link link-dark" href="#">Book</a>
</li>
</ul>
</div>
</div>
</nav>
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>

Answer 1

It's the navbar-light class which specifies the background for the toggle button. Add that to the nav element.
Navbars require a wrapping .navbar with .navbar-expand{-sm|-md|-lg|-xl|-xxl} for responsive collapsing and color scheme classes.
https://getbootstrap.com/docs/5.1/components/navbar/#how-it-works
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap#5.1.3/dist/css/bootstrap.min.css" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
<nav class="navbar navbar-light navbar-expand-lg">
<div class="container-fluid">
<a class="navbar-brand" href="#">Hello world</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#toggleMobileMenu" aria-controls="toggleMobileMenu" aria-expanded="false" aria-lable="Toggle Navigation">
<span class = "navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="toggleMobileMenu">
<ul class="navbar-nav ms-auto">
<li class="nav-item">
<a class="nav-link link-dark" href="#">About us</a>
</li>
<li class="nav-item">
<a class="nav-link link-dark" href="#">Pricing</a>
</li>
<li class="nav-item">
<a class="nav-link link-dark" href="#">Contact</a>
</li>
<li class="nav-item">
<a class="nav-link link-dark" href="#">Book</a>
</li>
</ul>
</div>
</div>
</nav>
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>