css---box-sizing 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>box-sizing</title>
    <style>
        .simple {
            width: 500px;
            height:200px;
            margin: 20px auto;
           background-color: #cccccc;
        }

        .fancy {
            width: 500px;
            height:200px;
            margin: 20px auto;
            background-color: #393939;
            padding: 50px;
            border: solid #c61732 10px;
            -webkit-box-sizing: border-box;
            -moz-box-sizing: border-box;
            box-sizing: border-box;
            color:#fff;
        }
    </style>
</head>
<body>
<div class="simple">2333</div>
<div class="fancy">22222</div>

</body>
</html>

设置了box-sizing的盒模型---此元素的内边距和边框不再会增加它的宽度。而是总的大小还是---500*200px

 

http://zh.learnlayout.com/box-sizing.html

posted @ 2018-01-24 16:03  千寻的天空之城  阅读(144)  评论(0)  编辑  收藏  举报