.page-content p {
    margin-top: 0.75em;   /* temporary spacing she requested */
    margin-bottom: 0.75em;
}

/* Author’s Note special spacing */
.page-content p.author-note {
    margin-top: calc(0.75em * 2); /* double space before */
    margin-bottom: 0;             /* no space after */
}

.page-content p.author-note + p {
    margin-top: 0; /* fixes margin collapsing after Author's Note */
}