body{background:#f4f4f5;margin:0;font-family:Arial,sans-serif}.container{box-sizing:border-box;text-align:center;flex-direction:column;justify-content:center;align-items:center;min-height:100vh;padding:24px;display:flex}.user{background:#fff;border-radius:12px;margin-top:20px;padding:20px}