.block-post-grid {
    margin-bottom: 1.5em;
}

.block-post-grid .post-grid-item-wrap {
    padding: 0 0.25em 0.5em;
    box-sizing: border-box;
}

.block-post-grid .post-grid-items  {
    margin-left: -0.25em;
    margin-right: -0.25em;
}