CSS 绝对定位、固定定位：样式修改示例
<!DOCTYPE html>
<html lang='en'>
<head>
<meta charset='UTF-8'>
<meta name='author' content='Xue Huanqun'>
<title>p72_73</title>
<style type='text/css'>
.relativeBlock{
width: 600px;
height: 300px;
background-color: #0077b6;
position: relative;
margin-top: 200px;
}
.absoluteBlock{
width: 50px;
height: 50px;
background-color: #90e0ef;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
border-radius: 50%;
}
.fixedBlock{
width: 20px;
height: 100px;
background-color: #f94144;
position: fixed;
top: 20px;
right: 20px;
border-radius: 10px;
box-shadow: 0 0 10px #f94144;
}
</style>
</head>
<body>
<div class='relativeBlock'>
<div class='absoluteBlock'>
<pre><code></div>
</code></pre>
</div>
<div class='fixedBlock'>
</div>
</body>
</html>
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