abstract：*{margin: 0px;padding: 0px;}a{text-decoration: none;color: black;font-size:13px;}.header{width: 100%;height: 40px;background-color: #F5F5F5}.header_content{width:1200px;height: 40px;margin: 0px auto;l
*{margin: 0px;padding: 0px;}
a{text-decoration: none;color: black;font-size:13px;}
.header{width: 100%;height: 40px;background-color: #F5F5F5}
.header_content{width:1200px;height: 40px;margin: 0px auto;line-height: 40px;}
.header_left{height: 40px;float: left;}
.header_right{width: 600px;height: 40px;float: right;}
.clear{clear: both;}
.header_left a{margin-right: 5px;}
.header_content a:hover{color:#FF5000;}
.header_a{display: inline-block;height: 40px;width: 90px;text-align: center;}
.header_a:hover{color: #FF5000;}
老师审批下
Correcting teacher：灭绝师太Correction time：2018-12-15 10:52:35
Teacher's summary：你这个给我看啥呀？效果也没有！下次作业代码全面点，最好附上完成图片……
