body {
  font-family: Palatino, Georgia, Times, serif;
  font-size: 150%;
  max-width: 30em;
  justify-content: center;
  text-align: justify;
  /* https://developer.mozilla.org/en-US/docs/Web/CSS/margin#Horizontal_centering_with_margin.3A_0_auto.3B */
  margin: 0 auto;
}
h1 {
  text-align:center;
  margin-left: 2em;
  margin-right: 2em;
}
p {
  margin-left: 2em;
  margin-right: 2em;
}