body {
  font-family: serif;
  max-width: 700px;
  margin: 50px auto;
  line-height: 1.8;
  color: #222;
}

nav a {
  margin-right: 15px;
  text-decoration: none;
  color: #003366;
}

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

hr {
  margin: 30px 0;
}