#author {
  font-size: 120%;
  font-style: italic;
  border-bottom: 1px solid black;
  margin-bottom: 1em;
  padding-bottom: 1em;
}

#archive {
  border-top: 1px solid black;
  margin-top: 1em;
  padding-top: 1em;
}

#blog {
  font-size: 120%;
  max-width: 640px;
  margin: 0 auto;
}