body {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 30rem;
  width: 30rem;
  max-width: 30rem;
  margin: 0 auto;
  align-items: stretch;
}

a {
  color: #000;
}

pre {
  padding: 1rem;
}
nav {
  display: flex;
  align-items: baseline;
  margin-top: 2rem;
}

nav h1 {
  flex-grow: 1;
  font-weight: 100;
}

nav h3 {
  margin-left: 1rem;
}