.wp-block-columns {
    display: flex;
    justify-content: space-between;
}

.wp-block-columns div:first-child {
    padding: 0 10px 0 0;
}

.wp-block-columns div:last-child {
    padding: 0 0 0 10px;
}


ul#sitemap_list li {
    margin: 0 0 10px 0;
    border-bottom: 1px solid #dadada;
    padding: 10px 0;
}