.region-container {
  display: -ms-flexbox;
  display: flex; }
  .region-container .region.half-width {
    -ms-flex-preferred-size: 50%;
        flex-basis: 50%; }
    .region-container .region.half-width .half-width {
      -ms-flex-preferred-size: calc(50% - 15px);
          flex-basis: calc(50% - 15px); }
      .region-container .region.half-width .half-width:first-child {
        margin-right: 15px; }
      .region-container .region.half-width .half-width:last-child {
        margin-left: 15px; }