Untitled Page

<!DOCTYPE html>
<html>
    <head>
        <link rel="stylesheet" href="style.css">
        <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-GLhlTQ8iRABdZLl6O3oVMWSktQOp6b7In1Zl3/Jr59b6EGGoI1aFkw7cmDA6j6gD"crossorigin="anonymous">
    </head>
    <body>
        <div class="pos-f-t">
            <div class="collapse" id="navbarToggleExternalContent">
                <div class="bg-dark p-4">
                    <h4 class="text-white">Collapsed content</h4>
                    <span class="text-muted">Toggleable via the navbar brand.</span>
                </div>
            </div>
        </div>
        <nav class="navbar navbar-dark bg-dark">
            <div class="container-fluid">
                <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarToggleExternalContent" aria-controls="navbarToggleExternalContent" aria-expanded="false" aria-label="Toggle navigation">
                    <span class="navbar-toggler-icon"></span>
                </button>
            </div>
        </nav>
    </body>
</html>