📄 style.css

.wp-block-post-author {
  display: flex;
  flex-wrap: wrap;
  box-sizing: border-box;
}
.wp-block-post-author__byline {
  width: 100%;
  margin-top: 0;
  margin-bottom: 0;
  font-size: 0.5em;
}
.wp-block-post-author__avatar {
  margin-right: 1em;
}
.wp-block-post-author__bio {
  margin-bottom: 0.7em;
  font-size: 0.7em;
}
.wp-block-post-author__content {
  flex-grow: 1;
  flex-basis: 0;
}
.wp-block-post-author__name {
  margin: 0;
}