head.php

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title><?= "WiFi-NET | " . $title ?></title>
    <!-- Bootstrap Core CSS -->
    <link href="css/bootstrap.min.css" rel="stylesheet">

    <link rel="stylesheet" type="text/css" href="css/mainstyle.css">
    <style>
        html,
        body {
            height: 100%;
        }
    </style>
</head>

<body>

</body>
<script src="js/jquery-3.6.0.min.js"></script>

<script src="js/bootstrap.min.js"></script>
<script src="js/main.js"></script>