How to close button in alerts example

Bootstrap 5 Code		Output
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js"></script> </head> <body> <div class="m-4"> <!-- Primary Dismiss Alert --> <div class="alert alert-primary alert-dismissible fade show"> <strong>Primary!</strong> An alert with close button!. <button type="button" class="btn-close" data-bs-dismiss="alert"></button> </div> <!-- Success Alert --> <div class="alert alert-secondary alert-dismissible fade show"> <strong>Secondary!</strong> An alert with close button! <button type="button" class="btn-close" data-bs-dismiss="alert"></button> </div> <!-- Success Alert --> <div class="alert alert-danger alert-dismissible fade show"> <strong>Danger!</strong> An alert with close button! <button type="button" class="btn-close" data-bs-dismiss="alert"></button> </div> <!-- Success Alert --> <div class="alert alert-light alert-dismissible fade show"> <strong>Light!</strong> An alert with close button! <button type="button" class="btn-close" data-bs-dismiss="alert"></button> </div> <!-- Success Alert --> <div class="alert alert-success alert-dismissible fade show"> <strong>Success!</strong> An alert with close button! <button type="button" class="btn-close" data-bs-dismiss="alert"></button> </div> <!-- Error Alert --> <div class="alert alert-danger alert-dismissible fade show"> <strong>Error!</strong> An alert with close button! <button type="button" class="btn-close" data-bs-dismiss="alert"></button> </div> <!-- Warning Alert --> <div class="alert alert-warning alert-dismissible fade show"> <strong>Warning!</strong> An alert with close button! <button type="button" class="btn-close" data-bs-dismiss="alert"></button> </div> <!-- Info Alert --> <div class="alert alert-info alert-dismissible fade show"> <strong>Info!</strong> An alert with close button! <button type="button" class="btn-close" data-bs-dismiss="alert"></button> </div> </div> </body> </html>		Primary! An alert with close button!. Secondary! An alert with close button! Danger! An alert with close button! Light! An alert with close button! Success! An alert with close button! Error! An alert with close button! Warning! An alert with close button! Info! An alert with close button!