.mb-2 {
  margin-bottom: 2rem;
}

.posts {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: 1fr;
  grid-column-gap: 2rem;
  grid-row-gap: 2rem;
}
.posts > div {
  width: 100%;
}
.post-card > img {
  width: 100%;
  object-fit: cover;
  object-position: center;
}

@media (min-width: 992px) {
  .posts {
    grid-template-columns: repeat(2, 1fr);
  }
}