body {
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    color: #fff;
}
.container {
    max-width: 450px;
    margin: 60px auto;
    text-align: center;
}
.card {
    background: #111;
    padding: 25px;
    border-radius: 12px;
}
button {
    width: 100%;
    padding: 12px;
    margin-top: 10px;
}
.buyBtn {
    background: #00e676;
}