body {
  font-family: system-ui, sans-serif;
  max-width: 720px;
  margin: 2rem auto;
  padding: 0 1rem;
  line-height: 1.6;
}

a {
  text-decoration: none;
}

ul {
  padding-left: 1.2rem;
}

h1, h2, h3 {
  line-height: 1.3;
}