docs-operation/css/custom.css

@media screen {
  body {
    box-sizing: border-box;
    max-width: 980px;
    margin: 0 auto;
    padding: 30px 45px;
  }
  .markdown-body {
    margin-bottom: 1em;
  }
  .FrontCover {
    margin-bottom: 60px;
  }
  .Footnote::before {
    content: "（";
  }
  .Footnote::after {
    content: "）";
  }
}

@media print {
  body {
    box-sizing: border-box;
  }

  /* github-markdown-cssのカスタマイズ */
  .markdown-body {
    /* font-family: "Source Han Serif JP", "MS PMincho", serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Source Han Sans JP", "Hiragino Kaku Gothic Pro", "MS PGothic"; */
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Source Han Sans JP", "Hiragino Kaku Gothic Pro", "MS PGothic";
  }
  h1, h2, h3, h4, h5, h6 {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Source Han Sans JP", "Hiragino Kaku Gothic Pro", "MS PGothic";
  }
  .bg-colored {
    background-color: #f6f8fa !important;
  }
  .bg-white {
    background-color: #ffffff !important;
  }
  table {
    margin-left: auto;
    margin-right: auto;
    display: table !important;
    margin-bottom: 1em !important;
  }
  table.page-break-inside-avoid {
    page-break-inside: avoid;
  }
  figure {
    margin-bottom: 1em;
    text-align: center;
    page-break-inside: avoid;
  }
  caption,
  figcaption {
    font-family: "Source Han Sans JP", source-sans-pro, source-han-sans, sans-serif;
  }
  pre {
    white-space: pre-wrap !important;
  }
  code {
    white-space: pre-wrap !important;
  }

  /* 表紙 */
  .FrontCover {
    font-family: "Source Han Sans JP", source-sans-pro, source-han-sans, sans-serif;
  }
  /* 文書タイトル */
  .FrontCover h1 {
    margin-top: 55mm;
    margin-bottom: 140mm;
    font-weight: 900;
    font-size: 28pt;
    text-align: center;
    page-break-after: avoid;
  }
  /* 宛先 */
  .Attn {
    font-weight: 600;
    font-size: 18pt;
    page-break-after: avoid;
  }
  /* 著者 */
  .Author {
    margin-bottom: 4mm;
    text-align: center;
    font-size: 16pt;
    line-height: 1em;
  }
  /* 日付 */
  .Published {
    margin-bottom: 4mm;
    text-align: center;
    font-size: 16pt;
    line-height: 1em;
  }
  
  /* はじめに */
  article:first-of-type {
    page-break-before: always;
    page: Preface;
  }
  
  /* 目次 */
  .TOC a::after {
    content: leader(dotted) " " target-counter(attr(href), page);
  }
  .TOC {
    page: TOC;
  }

  /* 本文 */
  article {
    counter-reset: page 1;
  }
  article h1:nth-child(n+2) {
    page-break-before: always;
  }

  /* 脚注 */
  .Footnote {
    text-align: justify;
    float: footnote;
    text-indent: 0;
    font-size: 10pt;
    line-height: 1.2;
    font-weight: normal;
  }
  ::footnote-call {
    content: counter(footnote, decimal) ")";
    font-size: 10pt;
    font-weight: normal;
    vertical-align: super;
  }
  ::footnote-marker {
    content: counter(footnote, decimal) ")";
    font-weight: normal;
    font-size: 1em;
    vertical-align: baseline;
  }

  /* 裏表紙 */
  .BackCover {
    page: BackCover;
    font-family: "Source Han Sans JP", source-sans-pro, source-han-sans, sans-serif;
  }
  .Colophon {
    text-align: justify;
    float: bottom page;
    text-indent: 0;
    font-size: 10pt;
    line-height: 1.2;
    font-weight: normal;
    border-top: .5pt solid black;
    padding-top: 0.5em;
  }

  .BackCover .Colophon .License {
    font-size: 8pt;
    line-height: 1.2;
    font-weight: normal;
  }

  /* ブックマーク */
  .markdown-body h1 {
    bookmark-level: 1;
  }
  .markdown-body h2 {
    bookmark-level: 2;
  }
  .markdown-body h3 {
    bookmark-level: 3;
  }

  @page {
    size: A4;
    @bottom-center {
      content: counter(page);
    }
    @footnote {
      float: page bottom;
      border-top: .5pt solid black;
      border-length: 30% 0;
      margin-top: 0.4em;
      padding-top: 0.3em;
      padding-left: 15pt;
    }
  }
  @page :first {
    @bottom-center {
      content: none;
    }
  }
  @page Preface {
    @bottom-center {
      content: counter(page, lower-roman);
    }
  }
  @page TOC {
    @bottom-center {
      content: none;
    }
  }
  @page BackCover {
    @bottom-center {
      content: none;
    }
  }
}