body {
  font-family: sans-serif;
  max-width: 700px;
  margin: 40px auto;
  padding: 0 20px;
  line-height: 1.6;
}

nav {
  margin-bottom: 20px;
  color: gray;
}

nav a {
  color: inherit;
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}

h1 {
  margin-top: 0;
}