body{font-family:sans-serif;background:#f4f6fb;margin:0}.center{display:flex;height:100vh;align-items:center;justify-content:center}.container{padding:20px}.card{background:#fff;padding:15px;margin:10px 0;border-radius:8px;box-shadow:0 2px 8px #0000000d}input{display:block;width:100%;margin:10px 0;padding:8px}button{padding:8px 12px;cursor:pointer}.error{color:red}