.diagram-reference {
  background: linear-gradient(135deg, #e5f3f1, #f9fcfc);
  border: 1px solid #b7d9d6;
  border-radius: 16px;
  padding: 18px 20px 8px;
}

.diagram-reference p {
  margin: 0;
  color: var(--brand);
  font-size: .9rem;
  font-weight: 750;
  letter-spacing: .03em;
}

.check-answer {
  display: inline-block;
  margin-top: 16px;
  padding: 8px 13px !important;
  font-size: .9rem;
}