Untitled

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>PositionRelative</title>

	<style type="text/css">
	/*setting position:relative*/
	/*偏移量是相對其原本位置*/
	#box1 {width: 300px; height: 300px; background-color: red;
		position: relative; top: 50px; left: 50px;}
	#box2 {width: 300px; height: 300px; background-color: green;}
	#box3 {width: 300px; height: 300px; background-color: blue;}
	</style>

</head>
<body>
	<div id="box1">box1</div>
	<div id="box2">box2</div>
	<div id="box3">box3</div>
</body>
</html>