<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
#dv1 {
width: 200px;
height: 200px;
background-color: #16a085;
}
#dv2 {
width: 100px;
height: 100px;
background-color: #e67e22;
/* 1.可以为父元素定义上边框
2.可以为父元素定义上内边距
3.可以为父元素添加overflow:hidden */
margin-top: 50px;
}
</style>
</head>
<body>
<div id="dv1">
<div id="dv2"></div>
</div>
</body>
</html>
