body { font-family: sans-serif; background: #f4f4f4; }
.login-box { width: 300px; margin: 100px auto; padding: 20px; background: white; border-radius: 8px; }
.login-box h2 { text-align: center; }
.login-box input, .login-box button { width: 100%; padding: 10px; margin-top: 10px; }