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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Good: Use `z-index: 0` to isolate The stacking context</title>
  <style>
    .box {
      width: 100px;
      height: 100px;
      text-align: center;
      line-height: 100px;
      font-size: 80px;
      position: absolute;
    }
    .a {
      background: green;
      margin: 0;
      z-index: 123;
    }
    .b {
      background: blue;
      margin: 20px 0 0 20px;
      z-index: 12;
    }
    .c {
      background: red;
      margin: 40px 0 0 40px;
      z-index: 1;
    }
    .d {
      background: yellow;
      margin: 50px 0 0 50px;
      /* Change 1: remove z-index: 2147483647; */
    }
    
    /* Change 2: Add .z-index-isolator-conatainer with z-index: 0 */
    .z-index-isolator-conatainer {
      position: relative;
      z-index: 0;
    }
  </style>
</head>
<body>
  <!-- Change 2: Add .z-index-isolator-conatainer tag -->
  <div class="z-index-isolator-conatainer">
    <div class="box a">A</div>
    <div class="box b">B</div>
    <div class="box c">C</div>
  </div>
  <div class="box d">D</div>
</body>
</html>
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