.case-studies__intro:not(:last-child) {
  margin-bottom: var(--spacer);
}

@media (min-width: 768px) {
  .case-studies__intro:not(:last-child) {
    margin-bottom: var(--spacer--lg);
  }
}

.case-studies__subheadline:last-child {
  margin-bottom: 0;
}