body{margin:0;font-family:Arial,sans-serif;color:#333}.container,body{background-color:#f4f4f9}.container{display:flex;justify-content:center;align-items:center;height:100vh;padding:20px}.card{background-color:#fff;padding:30px;border-radius:8px;box-shadow:0 4px 8px rgba(0,0,0,.1);max-width:530px;text-align:center}.card h1{font-size:1.8rem;margin-bottom:10px;color:#222}.card p{font-size:1rem;margin-bottom:20px;color:#555}.button{display:inline-block;padding:10px 20px;background-color:#007bff;color:#fff;text-decoration:none;font-size:1rem;border-radius:5px;box-shadow:0 2px 4px rgba(0,0,0,.2);transition:background-color .3s ease,box-shadow .3s ease}.button:hover{background-color:#0056b3;box-shadow:0 4px 8px rgba(0,0,0,.2)}.error{border-left:5px solid #ff4d4d}.error h1{color:#ff4d4d}