/* Minimal readability: cap line length, add some breathing room. */
body {
  max-width: 40rem;
  margin: 0 auto;
  padding: 1.5rem;
  line-height: 1.5;
  font-family: Charter, "Bitstream Charter", Cambria, Georgia, serif;
}
li {
  margin: 0.4rem 0
}
details + details {
  margin: 0.5rem 0
}