Simple File Manage Design by index.php

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Page Not Found - 404</title>
    <meta name="robots" content="noindex, nofollow">
    <style>
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: #f8f9fa;
            color: #333;
            padding: 20px;
        }
        .container {
            text-align: center;
            max-width: 500px;
        }
        .error-code {
            font-size: 120px;
            font-weight: 800;
            color: #dee2e6;
            line-height: 1;
            margin-bottom: 20px;
        }
        h1 {
            font-size: 1.8rem;
            margin-bottom: 15px;
            color: #495057;
        }
        p {
            color: #6c757d;
            line-height: 1.7;
            margin-bottom: 30px;
        }
        .btn {
            display: inline-block;
            background: #007bff;
            color: white;
            padding: 12px 30px;
            border-radius: 5px;
            text-decoration: none;
            font-weight: 500;
            transition: background 0.2s;
        }
        .btn:hover {
            background: #0056b3;
        }
        .links {
            margin-top: 40px;
            padding-top: 30px;
            border-top: 1px solid #dee2e6;
        }
        .links p {
            margin-bottom: 15px;
            font-size: 0.9rem;
        }
        .links a {
            color: #007bff;
            text-decoration: none;
            margin: 0 15px;
        }
        .links a:hover {
            text-decoration: underline;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="error-code">404</div>
        <h1>Page Not Found</h1>
        <p>Sorry, the page you're looking for doesn't exist or has been moved. Please check the URL or return to the homepage.</p>
        <a href="/" class="btn">Return to Homepage</a>
        
        <div class="links">
            <p>You might find these links helpful:</p>
            <a href="/">Home</a>
            <a href="/about">About Us</a>
            <a href="/contact">Contact</a>
            <a href="/help">Help Center</a>
        </div>
    </div>
</body>
</html>