index.html

<!DOCTYPE html>
<html lang="pt-BR">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Bootstrap básico</title>
    <link rel="stylesheet" href="./lib/bootstrap.min.css">
</head>
<body>
    <div class="container container-sm d-flex justify-content-center w-50 mt-5">
        <div class="navbar mt-5">
            <div class="d-flex justify-content-center w-100">
                <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#menu">
                    <span class="navbar-toggler-icon">
                        
                    </span>
                </button>
            </div>
        
            <nav class="collapse navbar-collapse mt-3" id="menu">
                <ul class="nav nav-pills navbar-nav text-center">
                    <li class="nav-item border" style="border-radius: 5px;">
                        <a class="nav-link " href="./a-cards.html">Cards</a>
                    </li>
                    <li class="nav-item border" style="border-radius: 5px;">
                        <a class="nav-link" href="./b-carousel.html">Carrossel</a>
                    </li>
                    <li class="nav-item border" style="border-radius: 5px;">
                        <a class="nav-link" href="./c-modal-popup.html">Modal ou pop-up</a>
                    </li>
                    <li class="nav-item border" style="border-radius: 5px;">
                        <a class="nav-link" href="./d-dropdown-menu.html">Menu dropdown</a>
                    </li>
                    <li class="nav-item border" style="border-radius: 5px;">
                        <a class="nav-link" href="./e-navbar.html">Barra de navegação</a>
                    </li>
                    <li class="nav-item border" style="border-radius: 5px;">
                        <a class="nav-link" href="./f-navbar-com-abas-e-toast.html">Abas e Toast</a>
                    </li>
                </ul>
            </nav>
        </div>
    </div>

    <script src="./lib/bootstrap.bundle.min.js"></script>
</body>
</html>