header.php

<meta charset = "utf-8" />
		<link rel = "stylesheet" type = "text/css" href = "assets/css/bootstrap.min.css" />
		<link rel = "stylesheet" type = "text/css" href = "https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" />
		<link href="https://cdn.datatables.net/1.10.20/css/dataTables.bootstrap4.min.css" rel="stylesheet" crossorigin="anonymous" />
 
	<link href="https://cdn.jsdelivr.net/npm/select2@4.1.0-beta.1/dist/css/select2.min.css" rel="stylesheet" />
		<link rel = "stylesheet" type = "text/css" href = "assets/css/style.css" />

	<script src = "assets/js/jquery-3.5.1.min.js"></script>
	<script src = "assets/js/bootstrap.min.js"></script>
	<script src="https://cdn.datatables.net/1.10.20/js/jquery.dataTables.min.js" crossorigin="anonymous"></script><script src="https://cdn.datatables.net/1.10.20/js/dataTables.bootstrap4.min.js" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/select2@4.1.0-beta.1/dist/js/select2.min.js"></script>