老师检查一下作业谢谢！

来源：2-18 编程练习

寿限无的丸子

2022-03-01 23:54:31

<!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);
            animation:arrowmove 1s linear 0.5s infinite;
        }
        @keyframes arrowmove{
            0%{
                bottom:50px;
            }
            30%{
                bottom:10px;
            }
            60%{
                bottom:20px;
            }
            100%{
                bottom:10px;
            }
        }
    </style>
</head>
<body>
    <div>&gt;</div>
</body>
</html>

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