【说站】css中flex-flow属性是什么

 .flex-flow{
            display: flex;
            display: -webkit-flex;
            flex-flow: column-reverse wrap;
            width: 300px;
            height: 200px;
            margin: auto;
            background-color: red;
        }
        .flex{
            width: 60px;
            height: 60px;
            border: 1px #000000 solid;
            background-color: aqua;
            text-align: center;
            line-height: 60px;
            color: #ffffff;
        }