body{font-family:Arial,sans-serif;padding:20px}.app{max-width:800px;margin:0 auto}.card{border:1px solid #ddd;padding:10px;margin:10px 0}input,textarea,select{display:block;margin:8px 0;padding:8px;width:100%;box-sizing:border-box}button{padding:8px 12px}