css3图片响应式布局

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Wsscat DEMO</title>
    </head>

    <body>
        <div class="box"></div>
        <div class="box"></div>
        <div class="box"></div>
        <div class="box"></div>
        <div class="box"></div>
        <div class="box"></div>
        <div class="box"></div>
        <div class="box"></div>
        <div class="box"></div>
        <div class="box"></div>
    </body>
    <style>
        body {
            margin: 0;
            padding: 0;
        }

        .box {
            float: left;
             30%;
            margin-top: 10px;
            margin-left: 2.5%;
            height: 0;
            padding-bottom: 33.98%;//或者padding-top
            background-color: #dbe0e4;
            background-image: url(1.jpg);//图片不要用标签，用这两个属性配合会更好控制图片缩放
            background-size: cover;
        }
    </style>
</html>