body {
      font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Helvetica, Arial, sans-serif;
      font-size: 16px;
      padding: 1em;
      color: #222;
      line-height: 1.4em;
    }
    H1, H2, H3 { line-height: 1.4em; }
    BUTTON { cursor: pointer; padding: 7px 14px; font-size: 18px; }
    .contained { max-width: 780px; margin: 0 auto; padding-left: 12px; padding-right: 12px; }