div.hidden,
div.navi,
div.part.code,
#expo {
  display: none;
}

body {
  font-family: Helvetica, Arial, Sans-Serif;
  font-size: 16px;
  line-height: 1.2;
  color: #000;
}

a {
  color: #000;
  text-decoration: underline;
}

@page {
  size: A4;
  margin: 1.5cm;
}

img {
  width: 12cm;
  page-break-inside: avoid;
}

h1 {
  page-break-before: always;
}

div.unit {
  page-break-inside: avoid;
  margin-top: 1.5cm;
}