body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    font-family: Arial, sans-serif;
    background: #f3f4f6;
    color: #111827;
}

.card {
    background: #ffffff;
    border: 1px solid #d1d5db;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    max-width: 420px;
}

a {
    color: #1d4ed8;
    font-weight: 700;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}