body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
      "Helvetica Neue", Arial, sans-serif;
    line-height: 1.3;
    font-size: 20px;
    margin: 0;
    background-color: #3c3c3c;
    color: #aaa;
  }
  a {
    color: #ddd;
  }
  strong {
    color: #ddd;
    font-weight: normal;
  }
  main {
    max-width: 460px;
    margin: 0 16px;
  }
  img#pingverb {
    width: 640px;
  }