login.php

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Login</title>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
</head>
<body>
<?php

// Include header
include('header.php');
?>
    <div class="container">
        <div class="row justify-content-center mt-5">
            <div class="col-md-4">
                <h2>Login</h2>

                <form method="POST" action="login.php">
                    <div class="form-group">
                        <label for="username">Username:</label>
                        <input type="text" name="username" id="username" class="form-control" required>
                    </div>
                    <div class="form-group">
                        <label for="password">Password:</label>
                        <input type="password" name="password" id="password" class="form-control" required>
                    </div>
                    <button type="submit" class="btn btn-primary">Login</button>
                </form>
                <p class="mt-3">Don't have an account? <a href="register.php">Register here</a>.</p>
            </div>
        </div>
    </div>
    <?php
// Include footer
include('footer.php');
?>
</body>
</html>