body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #111827;
    color: white;

    display: flex;
    justify-content: center;
    align-items: center;

    height: 100vh;
}

.card {
    background: #1f2937;
    padding: 40px;
    border-radius: 18px;
    text-align: center;

    width: 420px;
}

button {
    margin-top: 20px;
    padding: 14px 28px;

    border: none;
    border-radius: 12px;

    cursor: pointer;

    font-size: 16px;
}