body {
  padding: 100px 100px 400px 100px;
  font-size: 16px;
}

.title {
  font-size: 20px;
  margin-bottom: 20px;
}

.intro {
  font-family: Palatino, Optima, Georgia, serif;
  line-height: 1.6em;
}

.demo {
  width: 400px;
  margin: 60px 0px;
}

.wrapper + .wrapper {
  margin-top: 20px;
}