body {
  text-align: center;
}

#wrapper {
  width: 90%;
  margin: 0 auto;
  text-align: left;
}

@media screen and (min-width: 720px) {
  /* PC */
  #wrapper {
    max-width: 600px;
  }
}

.appendixes {
  margin-top: 5em;
}

.supplementaries {
  margin-top: 5em;
}