.post-list.vertical-tall {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0rem 4rem;
    width: 100%;
}

/* If you want to adjust spacing between rows */
.post-list.vertical-tall > div {
}

/* Clear margin on last row */
.post-list.vertical-tall > div:nth-last-child(-n+2) {
    margin-bottom: 0;
}