<!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>
div:nth-child(1) {
width: 200px;
height: 200px;
background-color: pink;
padding: 10px;
border: 10px solid red;
}
div:nth-child(2) {
/* 有了这句话就让盒子变成css3盒子模型 */
/* padding和border就不会撑大盒子了 */
box-sizing: border-box;
width: 200px;
height: 200px;
background-color: purple;
padding: 10px;
border: 10px solid skyblue;
}
</style>
</head>
<body>
<div></div>
<div></div>
</body>
</html>
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