html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
}

.pro-concept {
  font-family: 'Zen Old Mincho', serif;
  -ms-writing-mode: tb-rl;
  writing-mode: vertical-rl;
  margin: 0 auto;
  padding: 30px;
  box-sizing: border-box;
}
.pro-concept h2,
.pro-concept p {
  margin: 0 2em;
  line-height: 2.0em;
}
.pro-concept h2 {
  font-size: 20px;
}
.pro-detail {
  font-family: 'Zen Old Mincho', serif;
  font-size: 12px;
  width: 100%;
  padding: 0 30px;
  box-sizing: border-box;
}
.pro-detail > div {
  border-top: #ccc 1px solid;
  padding: 30px 0;
  box-sizing: border-box;
}
.pro-detail h2 {
  font-size: 20px;
  margin-bottom: 10px;
}
.pro-detail h3 {
  font-size: 14px;
  margin-top: 25px;
  margin-bottom: 10px;
}


@media screen and (max-width: 450px) {
  .pro-concept {
    font-family: 'Zen Old Mincho', serif;
    -webkit-writing-mode:horizontal-tb;
    -ms-writing-mode:lr-tb;
    writing-mode:horizontal-tb;
    margin: 0 auto;
    padding: 30px;
    box-sizing: border-box;
  }
  .pro-concept h2,
  .pro-concept p {
    margin: 1em 0;
    line-height: 2.0em;
  }
}