abstract：<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>CSS-box</title> <style type="text/css"> ul li{
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS-box</title>
<style type="text/css">
ul li{
background: #000;
list-style: none;
height: 40px;
line-height: 45px;
width: 100px;
color: #FFF;
font-size: 18px;
float: left;
display: block;
text-align: center;
border-bottom:#000 solid 7px;
}
ul li:hover{
border-bottom:greenyellow solid 7px;
}
</style>
</head>
<body>
<ul>
<li>首页</li>
<li>视频教程</li>
<li>社区问答</li>
<li>编程词典</li>
<li>手册下载</li>
</ul>
</body>
</html>
Correcting teacher：灭绝师太Correction time：2018-11-16 17:49:54
Teacher's summary：嗯！是挺懒的，下次这么懒作业就不给批了，加油干！