body{font-family:sans-serif;background:#f7f9fc;margin:0;padding:2rem;color:#333}.user-list{max-width:600px;margin:0 auto}.user-list ul{list-style:none;padding:0}.user-list li{margin-bottom:.5rem}button{padding:.5rem 1rem;font-size:1rem;border:none;background-color:#2563eb;color:#fff;border-radius:6px;cursor:pointer;transition:.2s ease}button:hover{background-color:#1d4ed8}.user-profile{margin-top:2rem;padding:1rem;border:1px solid #ddd;border-radius:8px;background-color:#fff}.error{color:red;font-weight:700}