body { font-family: Arial, sans-serif; background: #f4f4f4; margin: 0; padding: 20px; }
.container { max-width: 600px; margin: 0 auto; background: #fff; padding: 20px; border-radius: 4px; }
input[type="text"] { width: 100%; padding: 10px; margin-bottom: 10px; }
button { padding: 10px 20px; }