body {
  font-family: sans-serif;
  max-width: 700px;
  margin: 40px auto;
  padding: 0 20px;
  line-height: 1.5;
}

h1, h2, h3 {
  margin-top: 30px;
}

section {
  margin-bottom: 40px;
}

.placeholder {
  border: 1px solid #999;
  padding: 60px 20px;
  text-align: center;
  color: #999;
}