#author_name {
    display: block;
    /* Fluid: 2em from 534px up, down to 1.6em on a phone (xx-large was a hard 32px). */
    font-size: clamp(1.6em, 0.5em + 4.5vw, 2em);
    font-weight: bold;
    margin: 0;
}

#author_appears_in {
    display: block;
    font-weight: bold;
    margin: 0;
    margin-bottom: 25px;
}