css学习2

<!DOCTYPE html>
<html lang="en">
<head>
    <link rel="stylesheet" href="css盒模型.css">
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>

</div>
<div>

</div>
</body>
</html>
css样式

div:first-child{
    width:200px;
    height:200px;
    background-color: pink;
    box-sizing: content-box;
/*    就是以前的盒模型 w3c*/
    padding: 10px;
    border:15px solid red;
}
div:last-child{
    width:200px;
    height: 200px;
    background-color: purple;
    padding: 10px;
    box-sizing: border-box;
    border: 15px solid red;
}
/*现在新的盒模型*/

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