body {
    margin: 0 !important;
    padding: 0 !important;
    background: #000000 !important;
    background-image: none !important;
}

.card.card-iframe {
    border-radius: 12px;
}
.card.card-iframe .card-header {
    border-radius: 12px 12px 0 0;
}
.card.card-iframe .card-body {
    border-radius: 0 0 12px 12px;
}