alert boostrap

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
  <h2>Animated Alerts</h2>
  <p>The .fade and .in classes adds a fading effect when closing the alert message.</p>
  <div class="alert alert-success alert-dismissible fade in">
    <a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a>
    <strong>Success!</strong> This alert box could indicate a successful or positive action.
  </div>
  <div class="alert alert-info alert-dismissible fade in">
    <a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a>
    <strong>Info!</strong> This alert box could indicate a neutral informative change or action.
  </div>
  <div class="alert alert-warning alert-dismissible fade in">
    <a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a>
    <strong>Warning!</strong> This alert box could indicate a warning that might need attention.
  </div>
  <div class="alert alert-danger alert-dismissible fade in">
    <a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a>
    <strong>Danger!</strong> This alert box could indicate a dangerous or potentially negative action.
  </div>
</div>

</body>
</html>