* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  max-width: 42em;
  margin: 40px auto;
  padding: 0 10px;
  font: 18px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: #111;
  background: #fff;
}

h1,
h2 {
  line-height: 1.2;
}

nav {
  margin: 0 0 1rem;
}

nav a {
  margin-right: 0.75rem;
}

ul {
  padding-left: 1.2rem;
}

small {
  color: #444;
}