section .listado-posts {
    display: -webkit-flex;
    display: flex;
    -webkit-flex-wrap: wrap;
    flex-wrap: wrap;
    -webkit-justify-content: space-between;
    justify-content: space-between;
}

@media (min-width: 992px) {
    section #top {
        padding-right: 28.75rem;
    }
    section .listado-posts article {
        width: 137.5rem;
    }
    section .listado-posts article:nth-child(n + 3) {
        margin-top: 6rem;
    }
}
@media (max-width: 991px) {
    section .listado-posts article {
        margin-bottom: 6rem;
    }
}