*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1.5;
  color: #1a1a1a;
  background: #fafafa;
}

main {
  max-width: 45rem;
  margin: 0 auto;
  padding: 2rem 1rem;
}

#content h1,
#content h2,
#content h3,
#content h4 {
  margin: 1.5em 0 0.5em;
  font-weight: 600;
}

#content h1 { font-size: 1.75rem; }
#content h2 { font-size: 1.35rem; }
#content h3 { font-size: 1.15rem; }
#content h4 { font-size: 1rem; }

#content h1:first-child,
#content h2:first-child,
#content h3:first-child,
#content h4:first-child {
  margin-top: 0;
}

#content p {
  margin: 0 0 1em;
}

#content strong {
  font-weight: 600;
}