CENTER ALIGN BUTTON USING MARGIN AUTO CLASS

<!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 href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0/dist/css/bootstrap.min.css" rel="stylesheet" >
	<script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.9.2/dist/umd/popper.min.js" ></script>
	<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/js/bootstrap.min.js"></script>
</head>
<body>
	<h2 class="text-center">Center align buttons in container class</h2>
	<button class="btn btn-primary mx-auto d-block"> Button </button>
</body>
</html>