老師我在chrome瀏覽器上沒反應，代碼哪裡有問題呢?

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>3-1作业</title>
    <style>
        div {
            font-size: 14px;
            font-weight: bold;
            line-height: 50px;
            position: fixed;
            top: 0;
            right: 0;
            bottom: 0;
            left: 0;
            width: 200px;
            height: 50px;
            margin: auto;
            cursor: pointer;
            text-align: center;
            background: #abcdef;
            -webkit-transition: transform 2s ease-in-out .5s;
            transition: transform 2s ease-in-out .5s;          
        }
        /*此处写代码*/
       div:hover{
        transform: rotate(360deg) scale(2);
        -webkit-transition: transform 2s ease-in-out .5s;
        transition: transform 2s ease-in-out .5s;
       }
    </style>
</head>
<body>
    <div>www.imooc.com</div>
</body>
</html>

weixin_慕雪0272820 2020-06-22

源自：CSS3过渡 3-2 编程练习