login.html

<!DOCTYPE html>
<html>
<head>
    <title>Login</title>
</head>
<body>
    <h2>Login</h2>
    <form method="post">
        <label for="username">Username:</label>
        <input type="text" name="username" id="username" required>
        <br>
        <label for="password">Password:</label>
        <input type="password" name="password" id="password" required>
        <br>
        <button type="submit">Login</button>
    </form>
    {% with messages = get_flashed_messages(with_categories=true) %}
        {% if messages %}
            <ul>
                {% for category, message in messages %}
                    <li class="{{ category }}">{{ message }}</li>
                {% endfor %}
            </ul>
        {% endif %}
    {% endwith %}
</body>
</html>
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