body {
    font-family: Arial, sans-serif;
    background: #0f172a;
    color: white;
    text-align: center;
}

.container {
    padding: 40px;
}

.cards {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
}

.card {
    background: #1e293b;
    padding: 20px;
    border-radius: 10px;
    width: 200px;
}

button {
    margin-top: 10px;
    padding: 10px;
    border: none;
    background: #22c55e;
    color: white;
    cursor: pointer;
    border-radius: 5px;
}

.hidden {
    display: none;
}