@media(max-width: 991px) {
    .posts-in-category .col-md-4 {
        margin-bottom: 16px;
        width: 100%;
    }
    .posts-in-category .col-md-4:last-child {
        margin-bottom: 0;
    }
    .posts-in-category .category-post {
        padding-bottom: 16px;
        border-bottom: 1px solid var(--border-color);
    }
}