微信小程序学习笔记 flex布局2flex属性加上之后padding依然会撑大盒子,使用box-sizing:bor

flex 属性加上之后 padding 依然会撑大盒子,使用 box-sizing: border-box 可以不改变原来盒子的大小

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        div{
            width: 200px;
            height: 200px;
            background-color: red;
            display: flex;
            padding: 20px;
            box-sizing: border-box;
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>