请老师帮忙看一下作业谢谢啦

来源：2-20 编程练习

清夏_

2022-04-27 23:19:06

<!DOCTYPE html><html lang="en">
<head> <meta charset="UTF-8"> <title>2-4</title>  <style type="text/css"> div { font-family: 'Microsoft Yahei'; font-size: 60px; font-weight: bold; line-height: 600px; position: absolute; top: -1000px; right: 0; left: 0; width: 800px; height: 600px; margin: auto; text-align: center; border: 5px solid #000; border-radius: 50%; animation-name: disp; animation-duration: 1s; /*此处写代码*/ animation: ylj .5s linear 2s; }
@keyframes ylj { from { top: 0; }
to { top: 80px; } } </style></head>
<body> <div>大家好，欢迎来到慕课网！</div></body>
</html>