#article-content {
  width: 900px;
}

#article-content > section {
  margin-top: 30px;
  line-height: 1.6em;
  text-align: center;
}

#article-content > section > h1{
  font-size: 30px;
  margin-bottom: 0.5em;
  text-align: center;
}

#article-content > section > h2{
  font-size: 18px;
  font-weight: normal;
  text-align: center;
}

#article-content > section table {
  width: 100%;
  margin: 10px 0;
}

#article-content > section table tr td {
  width: calc(100% /3);
  text-align: center;
}