.sts_posts_sect .sect_title:not(:last-child) {
    margin-bottom: 1em;
    padding-bottom: 1em;
    border-bottom: 0.07em solid #E9E9E9;
}
.sts_posts_sect .posts {
    display: flex;
    flex-wrap: wrap;
    margin: -0.75em;
}
.sts_posts_sect .posts:not(:last-child) {
    margin-bottom: 0.75em;
}
.sts_posts_sect .post_card {
    margin: 0.75em;
    width: calc(100%/3 - 1.5em);
}