1. foot部分为什么直接设置text-align实现不了文字水平居中效果呢？
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.head{width:80%;height:100px;background:black;margin:0 auto;overflow:hidden;}
.head img{float:left;}
.head ul{float:right;color:white;list-style:none;font-weight:bold;}
.head ul li{float:left;padding:25px 25px 15px 25px;}
.content{width:80%;height:auto;margin:0 auto;overflow:hidden;}
.content .lside{width:50%;background:#add8e6;height:400px;float:left;}
.content .rside{width:50%;background:#add8e6;height:400px;float:right;}
.lside dl{padding-top:35px; padding-left:200px;}
.lside dt{font-size:20px;font-weight:bold;padding-bottom:10px;padding-left:40px;}
.lside dd{margin-bottom:10px;}
.lside span{background-color:pink;}
.rside dl{padding-top:35px; padding-left:50px;}
.rside dt{font-size:20px;font-weight:bold;padding-bottom:10px;padding-left:40px;}
.rside dd{margin-bottom:10px;}
.foot{width:80%;margin:0 auto;height:60px;background:black;line-height:60px;/*text-align:center;*/}
.foot ul{list-style:none;color:white;margin-left:220px;}
.foot ul li{float:left;padding-left:15px;font-size:10px;}
/*此处写代码*/
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<dd><span>职业路径</span> HTML5与CSS3实现动态页面</dd>
<dd><span>职业路径</span> HTML5与CSS3实现动态页面</dd>
<dd><span>职业路径</span> HTML5与CSS3实现动态页面</dd>
<dd><span>职业路径</span> HTML5与CSS3实现动态页面</dd>
<dd><span>职业路径</span> HTML5与CSS3实现动态页面</dd>
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