10k-css-sandboxing.css

@media (min-width: 20em) {
  .gallery__item {
    float: left;
    width: 45%;
    width: calc( 50% - 0.69rem);
    margin: 1.375rem 0 0 1.375rem;
    flex: 0 0 calc( 50% - 0.69rem);
  }
}
@media (min-width: 20em) and (max-width: 29.9375em) {
  .gallery__item:nth-child(odd) {
    margin-left: 0;
    clear: left;
  }
}