.grid-list__item--rounded:first-of-type:not(:only-child) > div {
    border-top-left-radius: var(--theme-outer-border-radius);
    border-top-right-radius: var(--theme-outer-border-radius);
}
.grid-list__item--rounded:last-of-type:not(:only-child) > div {
    border-bottom-left-radius: var(--theme-outer-border-radius);
    border-bottom-right-radius: var(--theme-outer-border-radius);
}
.grid-list__item--rounded:only-of-type > div {
    border-radius: var(--theme-outer-border-radius);
}

@media screen and (min-width: 768px) {
    .grid-list--rounded.grid-list--items-2-768 .grid-list__item--rounded:nth-child(-n+2) > div {
      border-top-left-radius: var(--theme-outer-border-radius);
      border-top-right-radius: var(--theme-outer-border-radius);
    }
    .grid-list--rounded.grid-list--items-2-768 .grid-list__item--rounded:nth-last-child(-n+2) > div {
      border-bottom-left-radius: var(--theme-outer-border-radius);
      border-bottom-right-radius: var(--theme-outer-border-radius);
    }
    .grid-list--rounded.grid-list--items-2-768 .grid-list__item--rounded:not(:nth-last-child(-n+2)):not(:nth-child(-n+2)) > div {
      border-radius: 0;
    }
}