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老师批语：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>4.固定定位</title>
<style type="text/css">
body {
height: 2000px;
}
div {
overflow: hidden;
}
.box {
width: 200px;
height: 200px;
background-color: lightskyblue;
position: fixed;
top: 200px;
left: 30px;
}
</style>
</head>
<body>
<div class="box"><img src="http://mi-888.com/PHP/zuoye/20180326/qqol.jpg" width="400"></div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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