老师，帮忙看下哪里有错

来源：2-18 编程练习

慕的地5368065

2021-04-22 22:44:19

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>2-9</title>
    <style type="text/css">
        div {
            font-family: Arial;
            font-size: 72px;
            font-weight: bold;
            position: fixed;
            right: 0;
            left: 0;
            width: 30px;
            height: 30px;
            margin: auto;
            transform: rotate(90deg);
            /*此处写代码*/
            animation:v 3s linear 5s infinite alternate;

        }
        @keyframes v
               from{

            transform:translateY(0) rotate(90deg)

        }

        to{
            transform:tranlateY(20px) rotate(90deg)
        }
    </style>
</head>
<body>
    <div>&gt;</div>
</body>
</html>