You are missing class navbar-light here
<nav class="navbar navbar-expand-lg bg-light">
it should be
<nav class="navbar navbar-expand-lg navbar-light bg-light">
This is the Bootstrap class definition in _navbar.scss
.navbar-light .navbar-toggler-icon {
background-image: url(data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%280, 0, 0, 0.55%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e);
}
Example
<html>
<head>
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-giJF6kkoqNQ00vy+HMDP7azOuL0xtbfIcaT9wjKHr8RbDVddVHyTfAAsrekwKmP1" crossorigin="anonymous" />
<script src="https://cdn.jsdelivr.net/npm/@popperjs/[email protected]/dist/umd/popper.min.js" integrity="sha384-q2kxQ16AaE6UbzuKqyBE9/u/KzioAlnx2maXQHiDX9d4/zp8Ok3f+M7DPm+Ib6IU" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.min.js" integrity="sha384-pQQkAEnwaBkjpqZ8RU1fF1AKtTcHJwFl3pblpTlHXybJjHpMYo79HY3hIi4NKxyj" crossorigin="anonymous"></script>
<title>Hello, world</title>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<div class="container-fluid">
<a class="navbar-brand me-auto" style="margin-left: 20px" href="#">Example Name</a
>
<button
class="navbar-toggler bg-light"
type="button"
data-bs-toggle="collapse"
data-bs-target="#navbarTogglerDemo02"
aria-controls="navbarTogglerDemo02"
aria-expanded="false"
aria-label="Toggle navigation"
>
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarTogglerDemo02">
<ul class="navbar-nav ms-auto mb-2 mb-lg-0">
<li class="nav-item">
<a class="nav-link active" aria-current="page" href="#"
>Option 1</a
>
</li>
<li class="nav-item"><a class="nav-link" href="#">Option 2</a></li>
<li class="nav-item"><a class="nav-link" href="#">Option 3</a></li>
</ul>
</div>
</div>
</nav>
</body>
</html>
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