纯css实现顶部进度条随滚动条滚动

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <title></title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <style type="text/css">
    body{
      overflow-y: scroll;
      overflow-x: hidden;
      background: linear-gradient(to right top, deepskyblue 50%, #eee 50%) no-repeat;
      background-size: 100% calc(100% - 100vh + 3px);
      white-space:normal;
      word-break:break-all;
      word-wrap:break-word;
    }
    body::after{
      content: '';
      position: fixed;
      top: 3px;
      left: 0; right: 0; bottom: 0;
      background: #fff;
      z-index: -1;
    }
  </style>
</head>
<body>
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</body>
</html>
 
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