default.php

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" href="styling.css">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>SKU-Updation</title>
    </head>
<body>
    <div class="header">
        
        <img class="logo" src="logo.png" alt="logo" class="logo">
        <h1 class="top_head1">COMPANY NAME PRIVATE LIMITED<br>Inventory Management System</h1> 
    </div>
    <br><br>
    <body>
    <h2 class="security_msg"> Security page. Pls click the button below to enter Inventory Management System</h2>
    <div class="securitybtn">
    <button onclick="openPopup()">Security button</button>
    </div>
    <script src="script.js"></script>
</body>
</html>
// Just simply the security-web.html, but both these files should be present in the Hosting website 