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CSS

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CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <!-- クリックしてモーダルを表示させるボタン -->
<a href="#" class="btn">モーダルウィンドウを表示</a>

<!-- オーバーレイ(黒い背景) -->
<div class="overlay"></div>

<!-- モーダルウィンドウ -->
<div class="modal">
  <!-- モーダルウィンドウを閉じる×ボタン -->
  <div class="close">&times</div>
    <h2>モダルのタイトル</h2>
    <p>ここにモダルの内容が入ります。ここにモダルの内容が入ります。ここにモダルの内容が入ります。ここにモダルの内容が入ります。ここにモダルの内容が入ります。ここにモダルの内容が入ります。</p>
</div>

<!-- 高さを出すためのsectionタグ -->
<section></section>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Noto Sans JP', sans-serif;
}

/* クリックしてモーダルウィンドウを表示するボタン */
.btn {
  display: inline-block;
  text-decoration: none;
  padding: 10px 20px;
  background: linear-gradient(to right bottom, #48D1CC, #008B8B);
  border-radius: 5px;
  color: #fff;
  margin: 20px;
  transition: 0.3s;
}

.btn:hover {
  opacity: 0.8;
}

/* オーバーレイ */
.overlay {
  /* 位置を固定 */
  position: fixed;
  top: 0;
  left: 0;
  /* 画面いっぱいに広がるようにする */
  width: 100%;
  height: 100vh;
  /* 黒い背景色(今回は黒で60%の不透明度) */
  background: rgba(0, 0, 0, 0.6);
  /* デフォルトでは非表示にしておく */
  display: none;
}

/* モーダルウィンドウ */
.modal {
  /* 大きさを指定 */
  max-width: 500px;
  width: 86%;
  /* 見た目を整える */
  padding: 15px 20px;
  background: #fff;
  /* 位置を固定表示 */
  position: fixed;
  /* 画面の真ん中に表示されるように指定 */
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  /* デフォルトでは非表示にしておく */
  display: none;
}

/* モーダルウィンドウ内にある×ボタン */
.modal .close {
  /* モーダルウィンドウを基準に位置を調整 */
  position: absolute;
  top: 10px;
  right: 20px;
  /* ホバーしたらカーソルの形になるようにする */
  cursor: pointer;
  font-size: 20px;
}

/* モーダルウィンドウ内の見出しのスタイル調整 */
.modal h2 {
  font-size: 18px;
  font-weight: normal;
  margin-bottom: 10px;
}

/* モーダルウィンドウ内の文章の文字サイズの調整 */
.modal p {
  font-size: 13px;
}

/* スクロールできるように高さを出すためのsectionタグ */
section {
  height: 200vh;
}
!

JS 

              
                $(document).ready(function(){ 
  // ボタンをクリックしたら
  $(".btn").click(function () {
    // モーダルウィンドウとオーバーレイをフェードインさせる
    $(".modal").fadeIn();
    $(".overlay").fadeIn();
  });

  // モーダルウィンドウ内の×ボタンかオーバーレイをクリックしたら
  $(".close, .overlay").click(function () {
    // モーダルウィンドウとオーバーレイをフェードアウトさせる
    $(".modal").fadeOut();
    $(".overlay").fadeOut();
   });
});
!
999px

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