.layout--threecol {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.layout--threecol > .layout__region {
  flex: 0 1 100%;
}

@media screen and (min-width: 576px) {
  .layout--threecol > .layout__region--column {
    flex: 0 1 calc(50% - 8px);
  }
}
@media screen and (min-width: 1280px) {
  .layout--threecol > .layout__region--column {
    flex: 0 1 calc(33.33% - 16px);
  }
}