.deck-base {
  box-shadow: inset 0 0 0 3px #000000;
  background-color: #00000020;
  position: relative;
  width: calc(var(--card-size) * 2.5);
  height: calc(var(--card-size) * 3.5);
  border-radius: calc(0.15 * var(--card-size));
}

.card-dragging {
  opacity: 0.5;
}