.thumb-75,
.thumb-bg-holder{
    padding-bottom: 56.25%;
}

.thumb-bg-holder img{
    position: absolute;
    height: 100%;
}

.featured-posts-grid__item--sm,
.featured-posts-grid__item--md,
.featured-posts-grid__item--lg{
    height: auto;
}
.featured-posts-grid__item--sm {
    margin-bottom: 18px;
}