.layout--two-col-66-33,
.layout--two-col-33-66 {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.layout--two-col-66-33 > .layout__region,
.layout--two-col-33-66 > .layout__region {
  flex: 0 1 100%;
}

@media screen and (min-width: 40em) {
  .layout--two-col-33-66 > .layout__region--first {
    flex: 0 1 calc((100% / 3) - 1rem);
  }
  .layout--two-col-33-66 > .layout__region--second {
    flex: 0 1 calc((100% / 3 * 2) - 1rem);
  }

  .layout--two-col-66-33 > .layout__region--first {
    flex: 0 1 calc((100% / 3 * 2) - 1rem);
  }

  .layout--two-col-66-33 > .layout__region--second {
    flex: 0 1 calc((100% / 3) - 1rem);
  }
}