百度前端技术学院-task1.10源代码

任务十的源代码，其实有github的，但就是不知道怎么弄，近期会学会的。在IE和firefox上检测运行良好。
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>six</title>
    <link rel="stylesheet" href="./six.css">
     <style>
       body{
            margin: 0;
            padding: 0;
        }

        ul {
            margin: 0;
            padding: 0;

        }

        li{
            list-style: none;
        }
        .flex-container {
            display: flex;
            align-items:center;
            flex-flow: row wrap;
            justify-content:  space-between;
            padding: 20px;
            }
        .flex-item {
            width: 150px;
            height: 120px;
            border: solid 1px  #f00;
            margin: 20px 0px;
            }
        .flex-item1 {
            width: 150px;
            height: 100px;
            border: solid 1px  #f00;
            margin: 20px 0px;
        }
        .flex-item2 {
            width: 150px;
            height: 40px;
            border: solid 1px  #f00;
            margin: 20px 0px;
        }
        .flex-item3 {
            width: 150px;
            height: 200px;
            border: solid 1px  #0f0;
            margin: 20px 0px;
        }
        @media all and (max- 640px) {
        .flex-item3{order:0;}
        .flex-item2{order:3;}
        .flex-item1{order:2;}
        .flex-item{order:1;}
        .flex-container {
            display: flex;
            align-items:flex-start;
            flex-flow: row wrap;
            justify-content:  space-between;
            padding: 20px;
            }
        }  
    </style>
</head>
<body>
    <ul class="flex-container">
        <li class="flex-item"> </li>
        <li class="flex-item1">2</li>
        <li class="flex-item2">3</li>
        <li class="flex-item3">4</li>
    </ul>
</body>
</html>