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HTML

            
              <ul class="table-of-contents">
  <li><a href="#イギリスのワーホリ留学について">イギリスのワーホリ・留学について</a>
    <ul>
      <li><a href="#基礎知識">基礎知識</a></li>
    </ul>
  </li>
  <li><a href="#出国前にやること手順">出国前にやること・手順</a>
    <ul>
      <li><a href="#YMSワーホリビザ申請手順">YMS・ワーホリビザ申請手順</a></li>
      <li><a href="#日本でやること">日本でやること</a>
        <ul>
          <li><a href="#豆知識">豆知識</a></li>
        </ul>
      </li>
      <li><a href="#準備">準備</a></li>
      <li><a href="#持ち物">持ち物</a></li>
      <li><a href="#保険">保険</a></li>
      <li><a href="#お金">お金</a></li>
      <li><a href="#渡英後にやること">渡英後にやること</a></li>
    </ul>
  </li>
  <li><a href="#イギリス生活の豆知識">イギリス生活の豆知識</a>
    <ul>
      <li><a href="#住宅">住宅</a></li>
      <li><a href="#学校">学校</a></li>
      <li><a href="#仕事">仕事</a></li>
      <li><a href="#美容">美容</a></li>
      <li><a href="#健康">健康</a></li>
      <li><a href="#英語">英語</a></li>
      <li><a href="#気づいたこと暮らしのこと">気づいたこと・暮らしのこと</a></li>
      <li><a href="#ふりかえり">ふりかえり</a></li>
    </ul>
  </li>
  <li><a href="#イギリス旅行ガイド">イギリス旅行ガイド</a>
    <ul>
      <li><a href="#スコットランド">スコットランド</a></li>
      <li><a href="#イングランド">イングランド</a></li>
      <li><a href="#北イングランド">北イングランド</a></li>
      <li><a href="#南イングランド">南イングランド</a></li>
    </ul>
  </li>
  <li><a href="#ヨーロッパ旅行ガイド">ヨーロッパ旅行ガイド</a>
    <ul>
      <li><a href="#ドイツ">ドイツ</a></li>
      <li><a href="#オランダ">オランダ</a></li>
      <li><a href="#ベルギー">ベルギー</a></li>
      <li><a href="#フランス">フランス</a></li>
      <li><a href="#スウェーデン">スウェーデン</a></li>
      <li><a href="#デンマーク">デンマーク</a></li>
      <li><a href="#フィンランド">フィンランド</a></li>
      <li><a href="#エストニア">エストニア</a></li>
      <li><a href="#ノルウェー">ノルウェー</a></li>
    </ul>
  </li>
  <li><a href="#叶えたい100のこと">叶えたい100のこと</a></li>
</ul>
!

CSS

            
              /*--------------------------------------
  もくじ
--------------------------------------*/
ul.table-of-contents {
  font-size: 12px !important;/*文字サイズ*/
  border: 1px solid #eee !important;
  padding: 1em 1.5em 1em 2.25em !important;
  color: #999 !important;
  display: inline-block;
}
ul.table-of-contents:before {
  content: "[  も く じ  ]"; /* お好きな文言に変更してください */
  display: inline-block;
  margin: 0.2em 0em 1em;
  padding: 0.2em 1em;
  font-weight: bold;
  background-color: #f5f5f5;
}
ul.table-of-contents a:after {
  display: none !important;
}
ul.table-of-contents li a,
ul.table-of-contents li a:visited {
  color: #999 !important; /* リンク文字の色 */
  text-decoration: none; /* リンクの下線あり・なし */
}
ul.table-of-contents li a:hover {
  color: #bac !important; /* リンクにマウスを重ねた時の色 */
}
ul.table-of-contents li {
  margin: 5px 0 10px 10px !important;
  line-height: 1.5;
  padding: 0;
  list-style-type: none !important;
}
ul.table-of-contents li:before {
  content: "▼"; /*お好きな記号に変更可能です*/
  position: absolute;
  left: 1.7em !important; /*左端からのアイコンまでの距離*/
  color: #fac;
}
ul.table-of-contents ul li,
ul.table-of-contents li ul {
  /* H1のみ表示させる */
  display: none !important;
}
!

JS
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