/* Shrink subheadings (h2-h4) within article content; leave page title (h1) untouched. */
article.bd-article h2,
.content h2 {
    font-size: 1.5rem;
}
article.bd-article h3,
.content h3 {
    font-size: 1.2rem;
}
article.bd-article h4,
.content h4 {
    font-size: 1.05rem;
}