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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

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About Vendor Prefixing

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <head>
  <meta name="viewport" content="width=device-width,initial-scale=1.0">
  <!--==============レイアウトを制御する独自のCSSを読み込み===============-->
  <link rel="stylesheet" type="text/css" href="https://assets.codepen.io/6329135/reset.css">
</head>

<body>
  <ul class="accordion-area">
    <li>
      <section>
        <h3 class="title">お見積もりの目安を教えてください。</h3>
        <div class="box">
          <p>内容によって変化いたしますのでまずはお問い合わせフォームよりご相談ください。</p>
        </div>
      </section>
    </li>
    <li>
      <section>
        <h3 class="title">地方ですが発注は可能でしょうか</h3>
        <div class="box">
          <p>可能です。お気軽にご相談ください。</p>
        </div>
      </section>
    </li>
    <li>
      <section>
        <h3 class="title">セミナーやイベントの出演を依頼したいのですが</h3>
        <div class="box">
          <p>お問い合わせフォームより日時や内容などをご記入いただきご相談ください。</p>
        </div>
      </section>

    </li>
  </ul>

  <script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
</body>
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CSS 

              
                @charset "UTF-8";

/*==================================================
アコーディオンのためのcss
===================================*/

/*アコーディオン全体*/
.accordion-area {
  list-style: none;
  width: 96%;
  max-width: 900px;
  margin: 0 auto;
}

.accordion-area li {
  margin: 10px 0;
}

.accordion-area section {
  border: 1px solid #ccc;
  border-radius: 5px;
  background: rgba(243, 243, 243, 0.3);
}

/*アコーディオンタイトル*/
.title {
  position: relative; /*+マークの位置基準とするためrelative指定*/
  cursor: pointer;
  font-size: 1rem;
  font-weight: normal;
  padding: 3% 3% 3% 50px;
  transition: all 0.5s ease;
}

/*アイコンの＋と×*/
.title::before,
.title::after {
  position: absolute;
  content: "";
  width: 15px;
  height: 2px;
  background-color: #333;
}
.title::before {
  top: 48%;
  left: 15px;
  transform: rotate(0deg);
}
.title::after {
  top: 48%;
  left: 15px;
  transform: rotate(90deg);
}
/*　closeというクラスがついたら形状変化　*/
.title.close::before {
  transform: rotate(45deg);
}

.title.close::after {
  transform: rotate(-45deg);
}

/*アコーディオンで現れるエリア*/
.box {
  display: none; /*はじめは非表示*/
  background: rgba(243, 243, 243, 0.5);
  margin: 0 3% 3% 3%;
  padding: 3%;
  border-radius: 5px;
}

/*========= レイアウトのためのCSS ===============*/

body {
  width: 100%;
  height: 100vh;
  vertical-align: middle;
  padding: 30px 0;

  /*背景画像設定*/
  background: url("https://assets.codepen.io/6329135/img_02.jpg") no-repeat
    center;
  background-size: cover;
}

h2 {
  text-align: center;
  margin: 30px 0;
  font-size: 1rem;
}
!

JS 

              
                //アコーディオンをクリックした時の動作
$(".title").on("click", function () {
  //タイトル要素をクリックしたら
  var findElm = $(this).next(".box"); //直後のアコーディオンを行うエリアを取得し
  $(findElm).slideToggle(); //アコーディオンの上下動作

  if ($(this).hasClass("close")) {
    //タイトル要素にクラス名closeがあれば
    $(this).removeClass("close"); //クラス名を除去し
  } else {
    //それ以外は
    $(this).addClass("close"); //クラス名closeを付与
  }
});

//ページが読み込まれた際にopenクラスをつけ、openがついていたら開く動作※不必要なら下記全て削除
$(window).on("load", function () {
  $(".accordion-area li:first-of-type section").addClass("open"); //accordion-areaのはじめのliにあるsectionにopenクラスを追加
  $(".open").each(function (index, element) {
    //openクラスを取得
    var Title = $(element).children(".title"); //openクラスの子要素のtitleクラスを取得
    $(Title).addClass("close"); //タイトルにクラス名closeを付与し
    var Box = $(element).children(".box"); //openクラスの子要素boxクラスを取得
    $(Box).slideDown(500); //アコーディオンを開く
  });
});
!
999px

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