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HTML

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Insecure Resource

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CSS

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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.

Vendor Prefixing

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JavaScript

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

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Babel includes JSX processing.

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HTML 

              
                <body>
<button id="modal-button">タップして開く</button>
</body>
!

CSS 

              
                body {
  background-size: cover;
  background-color: #efefef;
}
.modal {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background-color: rgba(0, 0, 0, 0.2);
  display: flex;
  justify-content: center;
  align-items: center;
}

.modal .inner {
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.9);
  margin: 10px;
  display: block;
  width: 960px;
  height: 540px;
  border-radius: 5px;
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.3);
  box-sizing: border-box;
  padding: 20px;
  text-align: center;
  background-color: rgba(255, 255, 255, 0.9);
  max-width: 600px;
  max-height: 400px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  color: #333;
  font-size: 1.5rem;
  animation: fadeInAnimation 200ms ease-out;
}

button{
    background: #666;
    color; #fff;
    text-decoration: none;
    color: #fff;
    text-align: center;
    border: none;
    border-radius: 4px;
    display: inline-block;
    height: 72px;
    line-height: 72px;
    padding: 0 32px;
    text-transform: uppercase;
    font-size: 2rem;
    cursor: pointer;
    transition: background-color 0.2s;
}
button:hover{
  background: #666;
  opacity: 0.8;
}

@keyframes fadeInAnimation {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
!

JS 

              
                //クリックした時の処理
document.querySelector('#modal-button').addEventListener('click', openModalWindow);

//モーダルウィンドウを表示する
function openModalWindow(){

  //モーダルを生成する→新しいタグを生成
  const modalElement = document.createElement('div');
  
  // 作ったdivの中にcss→modalを付与する
  modalElement.classList.add('modal');

  //モーダルウィンドウの中身を作る
  //新しいdivタグを生成する
  const innerElement = document.createElement('div');
  //作ったdivの中にcss→innerを付与する
  innerElement.classList.add('inner');
  innerElement.innerHTML =
  `<p>モーダルの中身です</p>
  <p>テキストや画像も入るよ</p>`
  ;
  //モーダルの中身に要素を配置する
  modalElement.appendChild(innerElement);
  //body要素にモーダルを配置する
  document.body.appendChild(modalElement);


  //中身をクリックしたらモーダルウインドウを削除する
  innerElement.addEventListener('click',() => {
    closeModalWindow(modalElement);
  });
}

//モーダルウインドウを閉じる
function closeModalWindow(modalElement){
  document.body.removeChild(modalElement);
}
!
999px

Console