/* Keep the complete generated series visible; titles are already in the artwork. */
.unit-art.unit-art-series,
.lesson-article .unit-art.unit-art-series {
  aspect-ratio: 1672 / 941;
  height: auto;
  min-height: 0;
  background: #eef6ff;
}
.unit-art.unit-art-series img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  padding: 0;
  filter: none;
}
.unit-art.unit-art-series::after,
.unit-art.unit-art-series .unit-art-label {
  display: none;
}
.unit-card:hover .unit-art.unit-art-series img {
  transform: none;
}

/* A new lesson shifts the following numbers. Keep the original full artwork,
   and place the current number only over its small old number, not its title. */
.unit-art.unit-art-series { container-type: inline-size; }
.unit-art-number {
  position: absolute;
  z-index: 2;
  left: 3.3%;
  top: 4.5%;
  width: 15%;
  height: 9.4%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  border-radius: 2px;
  color: #09246d;
  font: 600 2.4cqw/1 Georgia, "Times New Roman", serif;
  letter-spacing: .035em;
  white-space: nowrap;
}