老师您看下对不？

来源：2-18 编程练习

我不是胖球球

2021-04-27 17:38:53

相关代码：

<!DOCTYPE html>
<html lang="en">

<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: moveDown 1s linear 0.5s alternate infinite;
        }

        @keyframes moveDown {
            0% {
                bottom: 30px;

            }

            50% {
                bottom: 12px;
            }

            100% {
                bottom: 18px;
            }
        }
    </style>
</head>

<body>
    <div>&gt;</div>
</body>

</html>