body {
    font-family: Arial, sans-serif;
    background: #f0f0f0;
    text-align: center;
    padding: 30px;
}
form, .card {
    background: white;
    padding: 20px;
    margin: 20px auto;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.card button {
    margin-top: 10px;
    padding: 8px 16px;
    cursor: pointer;
}