404.html

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>404 Not Found</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f5f5f5;
            color: #333;
            margin: 0;
            padding: 0;
        }

        .container {
            max-width: 800px;
            margin: 0 auto;
            padding: 50px;
            text-align: center;
        }

        h1 {
            font-size: 4em;
            margin-bottom: 0.5em;
        }

        p {
            font-size: 1.5em;
            margin-bottom: 1em;
        }

        a {
            color: #333;
            text-decoration: underline;
        }
    </style>
</head>

<body>
    <div class="container">
        <h1>404</h1>
        <p>Oops! The page you requested was not found.</p>
        <p><a href="/">Go back to the homepage</a></p>
    </div>
</body>

</html>