求大神 解答 background position 定位问题 及解决为啥我的ul 不能一行过这样子
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>3.10新闻中心制作评测题</title>
<style type="text/css">
a{text-decoration:none;color:black;}
.topList{
width:300px;
height:180px;
border:1px solid;
color:#E8E8E8;
}
.topList ul{
list-style-type:none;
padding:5px;
}
em{
text-align:center;
font-style:normal;
display:block;
width:20px;
height:16px;
color:#333;
float:left;
background-image:url(http://img1.sycdn.imooc.com//53cf0fa20001d3dc00200032.jpg);
background-position:0px 16px;
}
.top em{
background-image:url(http://img1.sycdn.imooc.com//53cf0fa20001d3dc00200032.jpg);
background-position:16px 0px;
}
a :link,a:visted{
text-decoration:none;
color:#000;
}
a:active,a:hover{
color:#f00;
}
</style>
</head>
<body>
<div class="topList">
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