<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>margin叠加问题</title>
<style>
#box1{
width: 200px;height: 200px;background-color: blue;
margin-bottom: 30px;
}
#box2{
width: 200px;height: 200px;background-color: red;
margin-top: 30px;
}
</style>
</head>
<body>
<div id="box1">我是歌谣</div>
<div id="box2">我是顾顾</div>
</body>
</html><!DOCTYPE html>
<html lang="en">
<hea
