head{height：50px；padding-top：20px；}为什么height会变成70px
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
margin: 0;
padding: 0;
font-size: 14px;
}
a{
text-decoration: none;
color: #333;
}
.head{
height: 50px;
padding-top: 20px;
border-bottom: 10px solid #f60;
}
.head ul{
list-style-type: none;
height: 30px;
padding-left:50px;
/*border-bottom: 10px solid #f60;*/
}
.head ul li{
float: left;
}
.head ul li a{
display: block;
background: url("bg.png");
width: 120px;
height: 30px;
line-height: 30px;
text-align: center;
margin-left: 1px;
}
.head ul li a:hover{
background-position: 0 -30px;
color: #fff;
font-weight:bold;
font-size: 15px;
}
</style>
</head>
<body>
<div class="head">
<ul>
<li><a href="#">首 页</a></li>
<li><a href="#">音乐专题</a></li>
<li><a href="#">娱乐专题</a></li>
<li><a href="#">新闻专题</a></li>
<li><a href="#">游戏专题</a></li>
</ul>
</div>
</body>
</html>
