* {
  box-sizing: border-box;
}

body {
  font-family: Menlo, Monaco, 'Courier New', monospace;
}

#page {
  width: 480px;
  margin: 0 auto;
}

h1 {
  text-align: center;
}

h2 {
  margin: 0 0 0 0;
  text-decoration: underline;
}

.chapter {
  margin: 0 0 100px 0;
}