css/shortcodes/cards-pane.css

.card-deck {
  max-width: 83%;
}

.card {
  max-width: 80%;
}

.card-body.code {
  background-color: #f8f9fa;
  padding: 0 0 0 1ex;
}

.card-body pre {
  margin: 0;
  padding: 0 1rem 1rem 1rem;
}

.card .highlight {
  border: none;
}