<!DOCTYPE html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<!-- Bootstrap CSS -->
<link rel="stylesheet" type="text/css" href="css/bootstrap/bootstrap.css">
<link rel="stylesheet" type="text/css" href="css/bootstrap/bootstrap-grid.css">
<link rel="stylesheet" type="text/css" href="css/bootstrap/bootstrap-reboot.css">
<!-- CSS folder -->
<link rel="stylesheet" href="css/styles/style.css">
<!-- Fonts-awesome -->
<link rel="stylesheet" href="fonts-awesome/css/fontawesome.min.css">
<!-- Bootstrap social media -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<title>1</title>
</head>
<body>
<nav class="navbar navbar-dark navbar-expand-sm bg-primary fixed-top">
<div class="container">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#Navbar">
<span class="navbar-toggler-icon"></span>
</button>
<a class="navbar-brand mr-auto" href="#">Ristorante Con Fusion</a>
<div class="collapse navbar-collapse" id="Navbar"></div>
<ul class="navbar-nav mr-auto">
<li class="nav-item"><a class="nav-link active" href="#">Home</a></li>
<li class="nav-item"><a class="nav-link" href="./aboutUs.html">About</a></li>
<li class="nav-item"><a class="nav-link" href="#">Menu</a></li>
<li class="nav-item"><a class="nav-link" href="#">Contact</a></li>
</ul>
</div>
</nav>
<!-- JQery first, then Popper.js, then Bootstrap.js-->
<script src="js/jquery/jquery.js"></script>
<script src="js/popper/popper.min.js"></script>
<script src="js/bootstrap/bootstrap.js"></script>
<script src="js/bootstrap/bootstrap.bundle.js"></script>
<!-- fonts-awesome -->
<script src="fonts-awesome/js/fontawesome.js"></script>
</body>
</html>
Не работает кнопка, хотя делаю всё по видео.