.post-meta .author,
.post-meta .date,
.meta-author,
.meta-date,
.entry-meta time,
.byline,
.posted-on {
    display: none !important;
}

.related-posts .meta,
.related-posts .post-meta,
.related-posts .author,
.related-posts .date,
.related-posts .entry-meta,
.related-posts .byline,
.related-posts .posted-on {
    display: none !important;
}