main.single {
  width: min(960px, calc(100% - 4rem));
  max-width: none;
  margin: 0 auto;
  padding: 4rem 3rem 5rem;
  background: rgba(255, 255, 255, .5);
}

@media (max-width: 760px) {
  main.single {
    width: calc(100% - 2rem);
    padding: 2.5rem 1.25rem 3.5rem;
  }
}