css box model

0. 使用 box-sizing: border-box 

1. html page:<!DOCTYPE html>

<html lang="en">
<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" href="The_box_model.css" >
    <title>Title</title>
</head>
<body>

<div class="box"></div>

</body>
</html>


2. css

html {
    box-sizing: border-box;
}
*, *::before, *::after {
    box-sizing: inherit;
}

.box {
     350px;
    height: 150px;
    margin: 10px;
    padding: 25px;
    border: 5px solid black;
}
 
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原文地址：https://www.cnblogs.com/pascal1000/p/12956214.html