body{background:#f4f4f4;font-family:Arial,sans-serif}.container{background:#fff;border-radius:6px;max-width:400px;margin:80px auto;padding:20px}input,select,button{width:100%;margin-top:10px;padding:10px}button{color:#fff;cursor:pointer;background:#111827;border:none}.error{color:red;margin-top:10px}