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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">
  <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/Modaal/0.4.4/css/modaal.min.css">
</head>

<body>

  <section>
    <p>使用したライブラリ：<a href="http://humaan.com/modaal/" target="_blank">http://humaan.com/modaal/</a></p>

    <!--テキストを含む一般的なモーダル-->
    <ul class="info-list">
      <li><a href="#info-1" class="info">
          <dl>
            <dt>2019.5.12</dt>
            <dd>→ お知らせ1のタイトル</dd>
          </dl>
        </a></li>
      <li><a href="#info-2" class="info">
          <dl>
            <dt>2019.5.12</dt>
            <dd>→ お知らせ2のタイトル</dd>
          </dl>
        </a></li>
    </ul>

    <section id="info-1" class="hide-area">
      <h2>お知らせ1</h2>
      <p>おしらせの内容が入ります。</p>
    </section>

    <section id="info-2" class="hide-area">
      <h2>お知らせ2</h2>
      <p>おしらせの内容が入ります。</p>
    </section>

    <!--確認を促すモーダル-->
    <p><a href="#login" class="confirm">→ 確認画面モーダルリンク</a></p>
    <section id="login" class="hide-area"></section>

    <!--画像のモーダル-->
    <ul class="gallery-list">
      <!--data-groupに同じ名前を入れるとグループ化されて表示-->
      <li><a href="https://assets.codepen.io/6329135/img_01.jpg" class="gallery" data-group="gallery"><img src="https://assets.codepen.io/6329135/img_01.jpg" alt="" width="100"></a></li>
      <li><a href="https://assets.codepen.io/6329135/img_02.jpg" class="gallery" data-group="gallery"><img src="https://assets.codepen.io/6329135/img_02.jpg" alt="" width="100"></a></li>
      <li><a href="https://assets.codepen.io/6329135/img_03.jpg" class="gallery" data-group="gallery"><img src="https://assets.codepen.io/6329135/img_03.jpg" alt="" width="100"></a></li>
    </ul>

    <!--動画のモーダル-->
    <p><a href="https://www.youtube.com/embed/Wykqg9712qI?end=170&modestbranding=1&rel=0&controls=0" class="video-open">→ videoを開く</a></p>

    <!--iframeのモーダル-->
    <p><a href="https://web-navigator.com" class="iframe-open">→ iframeで指定のリンク先を開く</a></p>

  </section>

  <section id="info">
    <h2>Sale情報</h2>
    <p>11月1日～12月31日まで年末セールを開催！</p>
  </section>
  <!--/area1-->

  <script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/Modaal/0.4.4/js/modaal.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-cookie/1.4.1/jquery.cookie.js"></script>
</body>
!

CSS 

              
                @charset "utf-8";
/*========= モーダル表示のためのCSS ===============*/

/*全て共通：hideエリアをはじめは非表示*/
.hide-area {
  display: none;
}

/*全て共通：モーダルのボタンの色を変更したい場合*/
.modaal-close:after,
.modaal-close:before {
  background: #ccc;
}

.modaal-close:focus:after,
.modaal-close:focus:before,
.modaal-close:hover:after,
.modaal-close:hover:before {
  background: #666;
}

/*確認を促すモーダル：タイトルの色を変更したい場合*/
#modaal-title {
  font-size: 1.2rem;
  text-align: center;
  margin: 0 0 20px 0;
}

/*動画表示のモーダル：余白を変更したい場合*/
.modaal-video .modaal-inner-wrapper {
  padding: 0;
}

/*以下はコンテンツ内のレイアウト*/
.info-list dl,
.gallery-list {
  display: flex;
}

.info-list dt {
  margin: 0 10px 0 0;
}

.gallery-list li {
  margin: 0 10px 0 0;
}

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

body {
  vertical-align: middle;
  text-align: center;
  width: 100%;
  height: 100vh;
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  background-image: radial-gradient(
    circle farthest-corner at 10% 20%,
    rgba(222, 168, 248, 1) 0%,
    rgba(168, 222, 248, 1) 21.8%,
    rgba(189, 250, 205, 1) 35.6%,
    rgba(243, 250, 189, 1) 52.9%,
    rgba(250, 227, 189, 1) 66.8%,
    rgba(248, 172, 172, 1) 90%,
    rgba(254, 211, 252, 1) 99.7%
  );
}

header {
  background: #333;
}

header h1 {
  font-size: 1.5rem;
  text-align: center;
  text-transform: uppercase;
  padding: 20px;
  color: #fff;
}

h2 {
  font-size: 1.2rem;
  text-align: center;
  margin: 0 0 30px 0;
}

ul {
  list-style: none;
}

p,
ul {
  margin-top: 20px;
}

a {
  color: #333;
}

small {
  background: #333;
  color: #fff;
  display: block;
  text-align: center;
  padding: 20px;
}

section {
  padding: 30px;
}

img {
  max-width: 100%;
  height: auto;
}
!

JS 

              
                //テキストを含む一般的なモーダル
$(".info").modaal({
  overlay_close: true, //モーダル背景クリック時に閉じるか
  before_open: function () {
    // モーダルが開く前に行う動作
    $("html").css("overflow-y", "hidden"); /*縦スクロールバーを出さない*/
  },
  after_close: function () {
    // モーダルが閉じた後に行う動作
    $("html").css("overflow-y", "scroll"); /*縦スクロールバーを出す*/
  }
});

//確認を促すモーダル
$(".confirm").modaal({
  type: "confirm",
  confirm_title: "ログイン画面", //確認画面タイトル
  confirm_button_text: "ログイン", //確認画面ボタンのテキスト
  confirm_cancel_button_text: "キャンセル", //確認画面キャンセルボタンのテキスト
  confirm_content:
    "ログインが必要です。<br>この画面はボタンを押さなければ閉じません。" //確認画面の内容
});

//画像のモーダル
$(".gallery").modaal({
  type: "image",
  overlay_close: true, //モーダル背景クリック時に閉じるか
  before_open: function () {
    // モーダルが開く前に行う動作
    $("html").css("overflow-y", "hidden"); /*縦スクロールバーを出さない*/
  },
  after_close: function () {
    // モーダルが閉じた後に行う動作
    $("html").css("overflow-y", "scroll"); /*縦スクロールバーを出す*/
  }
});

//動画のモーダル
$(".video-open").modaal({
  type: "video",
  overlay_close: true, //モーダル背景クリック時に閉じるか
  background:
    "linear-gradient( 109.6deg,  rgba(218,185,252,1) 11.2%, rgba(125,89,252,1) 91.1% )", // 背景色
  overlay_opacity: 0.8, // 透過具合
  before_open: function () {
    // モーダルが開く前に行う動作
    $("html").css("overflow-y", "hidden"); /*縦スクロールバーを出さない*/
  },
  after_close: function () {
    // モーダルが閉じた後に行う動作
    $("html").css("overflow-y", "scroll"); /*縦スクロールバーを出す*/
  }
});

//iframeのモーダル
$(".iframe-open").modaal({
  type: "iframe",
  width: 800, //iframe横幅
  height: 800, //iframe高さ
  overlay_close: true, //モーダル背景クリック時に閉じるか
  before_open: function () {
    // モーダルが開く前に行う動作
    $("html").css("overflow-y", "hidden"); /*縦スクロールバーを出さない*/
  },
  after_close: function () {
    // モーダルが閉じた後に行う動作
    $("html").css("overflow-y", "scroll"); /*縦スクロールバーを出す*/
  }
});
!
999px

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