<html>
<head >
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>CSS相对定位</title>
<style type="text/css">
div {
background-color: Red;
width: 30px;
height: 30px;
}
#box_relative {
position: relative;
left: 10px;
top: 10px; background-color: gray;z-index:-1;
}
</style>
</head>
<body>
<div></div><div id="box_relative"></div><div style="z-index:30"></div>
</body>
</html>
运行结果
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