body {
    font-family: Arial, sans-serif;
    background: #f9f9f9;
    margin: 2rem;
}
form {
    background: white;
    padding: 1rem;
    border-radius: 8px;
}
input, button {
    margin: 0.4rem 0;
    padding: 0.5rem;
}
.error {
    color: red;
}