Tạo responsive Modal Images với CSS và JavaScript

Dưới đây là code để tạo responsive modal images bằng CSS và JavaScript:

Ví dụ

<!DOCTYPE html>
<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <style>
    *{
      box-sizing: border-box;
    }
    h1{
      text-align: center;
    }
    .ImgThumbnail {
      margin-left: 38%;
      border-radius: 5px;
      cursor: pointer;
      transition: 0.3s;
      height: 250px;
      width: 250px;
    }
    .modal {
      display: none;
      position: fixed;
      z-index: 1;
      padding-top: 100px;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      overflow: auto;
      background-color: rgb(0,0,0);
      background-color: rgba(0,0,0,0.9);
    }
    .modalImage {
      margin: auto;
      display: block;
      width: 50%;
      height: 60%;
      max-width: 700px;
    }
    #caption {
      margin: auto;
      display: block;
      width: 80%;
      max-width: 700px;
      text-align: center;
      color: #ccc;
      padding: 10px 0;
      height: 150px;
    }
    .close {
      position: absolute;
      top: 15px;
      right: 35px;
      color: #f1f1f1;
      font-size: 40px;
      font-weight: bold;
      transition: 0.3s;
    }
    .close:hover, .close:focus {
      color: rgb(255, 0, 0);
      cursor: pointer;
    }
    @media only screen and (max-width: 700px){
      .modalImage {
        width: 100%;
      }
    }
  </style>
</head>
<body>
  <h1>Image Modal Example</h1>
  <img class="ImgThumbnail" src="https://images.pexels.com/photos/3540375/pexels-photo-3540375.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940" alt="Snow" style="width:100%;max-width:300px">
  <div class="modal">
    <span class="close">×</span>
    <img class="modalImage" id="img01">
    <div id="caption">mage 1</div>
  </div>
  <script>
    var modalEle = document.querySelector(".modal");
    var modalImage = document.querySelector(".modalImage");
    let wow;
    document.querySelector('.ImgThumbnail').addEventListener('click',(event)=>{
      modalEle.style.display = "block";
      modalImage.src = event.target.src;
    })
    document.querySelector(".close").addEventListener('click',()=>{
      modalEle.style.display = "none";
    })
  </script>
</body>
</html>

Kết quả

Code trên cho kết quả:

Khi click ảnh, modal mở ra như sau: