div.center {
  text-align: center;
  margin: auto
}

div img {
  width: 100%;
  border-radius: 5px;
}

div.w420 {
  max-width: 420px;
}

div.w320 {
  max-width: 320px;
}

div.w220 {
  max-width: 220px;
}

ol li {
  margin: 1rem 0;
}


main ol {
  list-style: none;
  counter-reset: num;
}

main ol>li {
  counter-increment: num;
}

main ol>li>p {
  display: inline-block;
  margin: 0.5rem 0;
}

main li {
  margin: calc(0.7rem + 0.8vh) 0
}

main ol>li::before {
  content: counter(num) ". ";
}

html:is(.ayu) main ol>li::before {
  color: inherit
}

html:is(.rust, .light) main ol>li::before {
  color: #248eb8;
}

html:is(.coal, .navy) main ol>li::before {
  color: #ffa500;
}