body {
  margin: 40px auto;
  max-width: 650px;
  line-height: 1.6;
  font-size: 18px;
  color: #444;
  padding: 0 10px;
  font-family: serif;
}

h1, h2, h3 {
  line-height: 1.2;
}

h1, h2 {
  text-align: center;
}

hr {
  border: 0;
  border-top: 1px solid #ddd;
  margin: 32px 0;
}

.subtitle {
  font-style: italic;
  color: #666;
  text-align: center;
}

.small {
  font-size: 15px;
  color: #777;
}

.img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 24px auto;
}