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from flask import Flask, render_template, request, redirect, url_for app = Flask(__name__) # Dummy user database users = { "user1": "password1", "user2": "password2" } @app.route('/') def index(): return render_template('login.html') @app.route('/login', methods=['POST']) def login(): username = request.form['username'] password = request.form['password'] if username in users and users[username] == password: # Successful login return redirect(url_for('welcome', username=username)) else: # Failed login return render_template('login.html', message='Invalid username or password') @app.route('/welcome/') def welcome(username): return render_template('welcome.html', username=username) if __name__ == '__main__': app.run(debug=True) body { font-family: Arial, sans-serif; background-color: #f2f2f2; } .login-container { max-width: 400px; margin: 100px auto; padding: 20px; background-color: #fff; border-radius: 5px; box-shadow: 0 0 10px rgba(0, 0, 0, 0.1); } h2 { margin-bottom: 20px; text-align: center; } input[type="text"], input[type="password"] { width: 100%; padding: 10px; margin-bottom: 10px; border: 1px solid #ccc; border-radius: 5px; } input[type="submit"] { width: 100%; padding: 10px; background-color: #4caf50; color: #fff; border: none; border-radius: 5px; cursor: pointer; } input[type="submit"]:hover { background-color: #45a049; } .error { color: red; margin-top: 10px; text-align: center; }

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