.project-group {
  margin-top: 2rem;
}
.project-group ~ .project-group {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(0, 0, 0, .14);
}
.project-group-heading {
  margin-bottom: 1.5rem;
  padding: 1rem 1.25rem;
  border-left: 4px solid #547a76;
  border-radius: 0 .5rem .5rem 0;
  background: #edf3f2;
}
.prose .project-group-heading h2 {
  margin: 0;
  font-size: 1.4rem;
  line-height: 1.4;
  font-weight: 700;
}
html.dark .project-group ~ .project-group {
  border-top-color: rgba(255, 255, 255, .18);
}
html.dark .project-group-heading {
  border-left-color: #90b8b1;
  background: #303b3a;
}
@media (max-width: 640px) {
  .project-group ~ .project-group { margin-top: 2.75rem; padding-top: 1.5rem; }
  .project-group-heading { padding: .8rem 1rem; }
}