padding是内边距 是作用于自身元素
margin是外边距 作用的是自身以外的元素
<!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>
.padding {
width: 100px;
height: 100px;
background: red;
padding: 20px;
}
.margin {
width: 100px;
height: 100px;
background: antiquewhite;
margin: 20px;
}
</style>
</head>
<body>
<div class="padding">
<h2>padding</h2>
</div>
<div class="margin">
<h2>margin</h2>
</div>
</body>
</html>
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