#guestbook {
  max-width: 800px;
  margin: 40px auto;
  padding: 20px;
  background: #111;
  border: 2px solid #8b0000;
  box-shadow: 0 0 25px #8b0000;
}

#guestbook h2 {
  text-align: center;
  color: #c9b37e;
  font-family: "Garamond", serif;
}

#guestbook iframe {
  background: white;
  border-radius: 8px;
}