css背景图撑开盒子高度

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>背景图撑开盒子高度</title>
        <style> 
        .bg-box {
                background-image: url(../demo.jpg);
                background-size: 100% 100%; 
                background-repeat: no- repeat; margin:0 auto; 
        }
         .bg-box::after {
               content: "";
               display: block;
               /*这里的padding = height / width*/ 
         padding:20%; } </style> </head> <body> <div class="bg-box"></div> </body> </html>

 

posted @ 2017-06-28 14:29  WEB1010113045  阅读(1884)  评论(0编辑  收藏  举报