Sử dụng thuộc tính data để đóng cảnh báo
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Dismissal of Bootstrap Alerts via Data Attributes</title>
<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">
<div class="alert alert-info alert-dismissible fade show">
<strong>Note!</strong> This is a simple example of dismissible alert.
<button type="button" class="btn-close" data-bs-dismiss="alert"></button>
</div>
</div>
</body>
</html>
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