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HTML

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Adding Classes

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About the <head>

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Insecure Resource

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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 

              
                <!-- モーダルを開くボタン -->
<button class="modal-open js-modal-open">モーダルを開く</button>

<!-- モーダル本体 -->
<div class="modal js-modal">
  <div class="modal-container">
    <!-- モーダルを閉じるボタン -->
    <div class="modal-close js-modal-close">×</div>
    <!-- モーダル内部のコンテンツ -->
    <div class="modal-content">
      <p>私も今いくらこの講演めというもののためで打ち壊さまいた。いかに次第を腐敗顔はもう大きな用意ないだかもに思っばいですがは料理しですますて、なぜにも行くたありありです。</p>
      <p>国が与えたのはむしろ結果にいよいようますだ。</p>
      <p>どうか嘉納さんが意味思想元々附与をいうない骨そんな箸それか排斥がという今失敗ですでしょたんて、この十一月は私か文学鉱脈の防ぐて、岡田さんの点を盲目の私を現に小学問と出て私学校をお払底をしようにとうていご発見へ仕ないでて、依然としてけっして始末と入れらしいていでし訳に越せなだ。しかししかしご他人へさものは更に普通とするないて、ほんの他がはあっでがという男を知れているですです。この所先生の上その厭世はあなた中を気に入るだかと岡田さんがしたらた、主義の昔んに対してお注文ですだませば、個性のためを仕合せを今までの金力を先刻なって行くて、こうの将来が見えからこの時を別にあっあるましと描くましものますて、ないでんながらああお個人受けるた気たらたた。だから評語か高等か落第を思っでて、事実ごろ本位がしから得るん所のご観念の今を向いですなかっ。ほかをはもっともなりていたうんたと、よく初めてなるてお話はどうなしないのた。</p>
      <p>たとえば皆附随に出てはみたものべきて、文学をは、単にそれかするから思わられなう得せですんとして、床も云っていんう。</p>
    </div>
  </div>
</div>
!

CSS 

              
                /* モーダルを開くボタン */
.modal-open{
  position: fixed;
  top: 50%;
  left: 50%;
  font-size: 16px;
  font-weight: bold;
  width: 300px;
  height: 60px;
  color: #fff;
  background: #000;
  border: none;
  cursor: pointer;
  translate: -50% -50%;
}

/* モーダルと背景の指定 */
.modal{
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  text-align: center;
  background: rgba(0,0,0,50%);
  padding: 40px 20px;
  overflow: auto;
  opacity: 0;
  visibility: hidden;
  transition: .3s;
  box-sizing: border-box;
}

/* モーダルの擬似要素の指定 */
.modal:before{
  content: "";
  display: inline-block;
  vertical-align: middle;
  height: 100%;
  margin-left: -0.2em;
}

/* クラスが追加された時の指定 */
.modal.is-active{
  opacity: 1;
  visibility: visible;
}

/* モーダル内側の指定 */
.modal-container{
  position: relative;
  display: inline-block;
  vertical-align: middle;
  max-width: 600px;
  width: 90%;
}

/* モーダルを閉じるボタンの指定 */
.modal-close{
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  top: -20px;
  right: -20px;
  width: 40px;
  height: 40px;
  color: #fff;
  background: #000;
  border-radius: 50%;
  cursor: pointer;
}

/* モーダルのコンテンツ部分の指定 */
.modal-content{
  background: #fff;
  text-align: left;
  line-height: 1.8;
  padding: 20px;
}

/* モーダルのコンテンツ部分のテキストの指定 */
.modal-content p{
  margin: 1em 0;
}
!

JS 

              
                //要素を取得
const modal = document.querySelector('.js-modal'),
      open = document.querySelector('.js-modal-open'),
      close = document.querySelector('.js-modal-close');

//「開くボタン」をクリックしてモーダルを開く
function modalOpen() {
  modal.classList.add('is-active');
}
open.addEventListener('click', modalOpen);

//「閉じるボタン」をクリックしてモーダルを閉じる
function modalClose() {
  modal.classList.remove('is-active');
}
close.addEventListener('click', modalClose);

//「モーダルの外側」をクリックしてモーダルを閉じる
function modalOut(e) {
  if (e.target == modal) {
    modal.classList.remove('is-active');
  }
}
addEventListener('click', modalOut);
!
999px

Console