CSS Layout - 如何绝对位置

我们想知道如何绝对位置。

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<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
.image {
  position: relative;
}
.wrapper {
  position: absolute;
  top: 50%;
  left: 0;
}
h2 {
  margin: 0;
  padding: 0;
}
</style>
</head>
<body>
  <div class="image">
    <img src="http://www.w3cschool.cn/style/download.png" />
    <div class="wrapper">
      <h2>Title</h2>
    </div>
  </div>
</body>
</html>
 
 
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CSS Layout - 如何绝对位置
