main { max-width: 840px; margin: 40px auto; padding: 0 16px; }
pre code { white-space: pre-wrap; }
article :is(h1,h2,h3) { scroll-margin-top: 80px; }
nav#toc { margin-bottom: 2rem; }
.muted { color: #68707d; font-size: 0.9rem; }