position定位，常用的有fixed，relative和absolute，其中：
fixed：固定定位，相对于body定位；
relative：相对定位，相对于其正常位置进行定位；
absolute：绝对定位，相对于父级定位；
其中要注意：子绝父相；在进行绝对定位的时候，一定在在期父级元素给一个相对定位；
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<!DOCTYPE html>
<head>
<meta charset="utf-8">
<title>优酷-这世界很酷</title>
<link rel="icon" type="image/x-icon" href="static/images/1.ico">
<link rel="stylesheet" type="text/css" href="static/font-awesome/css/font-awesome.min.css">
<style type="text/css">
*{margin: 0;padding-left: 0;}
li{list-style: none;float: left;}
a{text-decoration: none;color: #000;}
small{color: #989898;}
.mr{margin-right: 10px;}
.mt{margin-top: 20px;}
.l{float: left;}
.r{float: right;}
.clear{clear: both;}
.contents{
width: 1740px;
margin: 0 auto;
}
.content{
width: 100%;
margin-top: 20px;
}
.contentUL{line-height: 70px;}
.hot_tv img{
/*margin:5px;*/
width: 240px;
height: 360px;
}
.tab li{margin-left: 25px;}
.big_show{
width: 490px;
height: 350px;
margin:0 10px 0 0;
}
.tv_tab{
width: 1240px;
}
.tv_tab img{
margin:0px 4px ;
width: 240px;
height: 135px;
}
.tv_tab li{
margin-bottom: 16px;
}
/*轮播模块+头部导航*/
.header{
position: relative;/*相对定位*/
width: 100%;
height:520px;
background:rgb(50,0,1);
}
/*轮播图*/
.pic_show{
width: 1664px;
height:520px;
background: url(static/images/header1.jpg);
margin: 0 auto;
position: relative;
}
.bg{
/*opacity:1;*/
width:100%;
height: 100%;
background: url(static/images/header_1.png);
position: absolute;left: 0;top:0;z-index:999;/*绝对定位*/
}
/*轮播上的logo+搜索框*/
.header_ul{
position: fixed;top:0;left:90px;z-index: 1000;
}
.logo form{
width: 500px;
height: 40px;
position: relative;margin-left:500px;/*top: -30px;*/
display: inline-block;
}
.logo input{
width: 480px;
height: 40px;
border-radius: 100px;
border:none;
background:rgba(255,255,255,0.5);
outline: none;
padding-left: 20px;
color: #fff;
}
.logo button{
width: 90px;
height: 42px;
border-top-right-radius: 30px;
border-bottom-right-radius: 30px;
border: none;
background:#B30702;
color: #fff;
position:absolute;right:0;top:0;
}
.menu_li a,i{color: rgba(234,234,234,0.5);}
.menu_li li{
padding: 0 10px;
text-align: center;
font-size: 12px;
position: relative;
}
.menu_li i{
font-size: 18px;
/*font-weight: bold;*/
}
.menu_li li:hover a{color:#48ADF2; }
.menu_li li:hover i{color:#48ADF2; }
.menu_li .box{
position: absolute;top: 50px;right: -5px;
background:#fff;
padding: 20px;
display: none;
}
.menu_li p{color:#ccc;font-size: 16px;}
.menu_li button{
background: #2798ff;
color: #fff;
border:none;
width:240px;
height: 36px;
border-radius: 30px;
margin-top: 15px;
}
.menu_li li:hover .box{display: block;}
.menu_li .log a,i{
color: #ccc;
font-size: 12px;
}
.menu_li .log{
line-height: 20px;
}
.menu_li ul{
width: 280px;
}
.menu_li .box_icon{
width: 120px;
height: 120px;
}
.menu_li .box_icon a,i{
color: #ccc;
font-size: 14px;
}
</style>
</head>
<body>
<!-- 头部轮播图+搜索 -->
<div class="header">
<div class="pic_show">
<div class="bg"></div>
<div class="contents header_ul">
<div class="logo l mt">
<a href=""><img src="static/images/logo.png""></a>
<form>
<input type="text" name="">
<button>全搜索</button>
</form>
</div>
<ul class="menu_li r mt">
<li><i class="fa fa-viacoin" style="color: #c4a25a" ></i><br><a href="" style="color: #c4a25a">VIP</a></li>
<li><i class="fa fa-feed"></i><br><a>订阅</a></li>
<li><i class="fa fa-clock-o"></i><br><a>记录</a>
<div class="box">
<ul class="log">
<li>今天</li>
<li>
<ul>
<li><a href=""></a>......</li>
<li><i class="fa fa-television">已收看**%</i></li>
<li><a href=""></a>......</li>
<li><i class="fa fa-television">已收看**%</i></li>
</ul>
<li>一周内</li>
<li>
<ul >
<li><a href=""></a>......</li>
<li><i class="fa fa-television">已收看**%</i></li>
<li><a href=""></a>......</li>
<li><i class="fa fa-television">已收看**%</i></li>
</ul>
</li>
</ul>
</div>
</li>
<li><i class="fa fa-arrow-up"></i><br><a>上传</a>
<div class="box">
<span class="arrow"></span>
<p>登录使用更多功能</p>
<button>登录/注册</button>
</div>
</li>
<li><i class="fa fa-television"></i><br><a>客户端</a>
<div class="box" >
<ul >
<li class="box_icon" >
<a href="#">
<img src="static/images/icon.png"><br>
<span>优酷客户端</span>
</a><br>
<small>快速.稳定的观看体验</small>
</li>
<li class="box_icon">
<a href="#">
<img src="static/images/qr.jpg" style="width: 70px;height: 70px;margin-top: 3px;"><br>
<span>优酷移动APP</span>
</a><br>
<small>全网独播尽在手中</small>
</li>
</ul>
<p><a href=""><i class="fa fa-television">优酷TV版</i></a>CIBN酷喵影视智能电视App</p>
</div>
</li>
<li><a href=""><img src="static/images/80.png" width="40px" style="margin-top: -5px;"></a>
<div class="box">
<span class="arrow"></span>
<p>登录使用更多功能</p>
<button>登录/注册</button>
</div>
</li>
</ul>
</div>
<div class="clear"></div>
</div>
</div>
<!-- 分类标签 -->
<div class="contents">
<div class="content">
<div class="contentUL">
<h2>正在热播</h2>
</div>
<ul class="hot_tv">
<li class="mr">
<a href="#">
<img src="static/images/a.jpg"><br>
<span>瞰中国:宁夏</span>
</a><br>
<small>低调的宁夏 美了四季</small>
</li>
<li class="mr">
<a href="#">
<img src="static/images/b.jpg"><br>
<span>摘金奇缘</span>
</a><br>
<small>低调的宁夏 美了四季</small>
</li>
<li class="mr">
<a href="#">
<img src="static/images/c.jpg"><br>
<span>王牌对王牌</span>
</a><br>
<small>低调的宁夏 美了四季</small>
</li>
<li class="mr">
<a href="#">
<img src="static/images/d.jpg"><br>
<span>我们村里人</span>
</a><br>
<small>低调的宁夏 美了四季</small>
</li>
<li class="mr">
<a href="#">
<img src="static/images/e.jpg"><br>
<span>瞰中国:宁夏</span>
</a><br>
<small>低调的宁夏 美了四季</small>
</li>
<li class="mr">
<a href="#">
<img src="static/images/f.jpg"><br>
<span>大城小聚</span>
</a><br>
<small>低调的宁夏 美了四季</small>
</li>
<li class="mr>
<a href="#">
<img src="static/images/g.jpg"><br>
<span>托你缇娜</span>
</a><br>
<small>低调的宁夏 美了四季</small>
</li>
</ul>
</div>
<div class="clear"></div>
<div class="content">
<div class="contentUL">
<h2 class="l mr">剧集 > </h2>
<ul class="tab 1">
<li>最新</li>
<li>大陆剧</li>
<li>日韩剧</li>
<li>港台剧</li>
<li>英美剧</li>
</ul>
</div>
<div class="clear"></div>
<div class="tv_show">
<div class="big_show l mr">
<a href="#">
<img src="static/images/tv.jpg"><br>
<span>逆流而上的你..爆笑</span>
</a><br>
<small>新晋辣妈萌爸！庞月明玛丽咸鱼夫妻带娃逆袭！</small>
</div>
<ul class="tv_tab l">
<li >
<a href="#">
<img src="static/images/tv1.jpg"><br>
<span>都挺好</span>
</a><br>
<small>姚晨郭京飞陷亲情漩涡</small>
</li>
<li>
<a href="#">
<img src="static/images/tv2.jpg"><br>
<span>乡村爱情11</span>
</a><br>
<small>刘能赵四争C位</small>
</li>
<li >
<a href="#">
<img src="static/images/tv3.jpg"><br>
<span>小女花不弃</span>
</a><br>
<small>林依晨张彬彬苏甜来袭</small>
</li>
<li >
<a href="#">
<img src="static/images/tv4.jpg"><br>
<span>春暖花又开</span>
</a><br>
<small>姚芊羽李建上演新农村创业</small>
</li>
<li>
<a href="#">
<img src="static/images/tv5.jpg"><br>
<span>老中医</span>
</a><br>
<small>陈宝国冯远征许晴弘扬医道</small>
</li>
<li>
<a href="#">
<img src="static/images/tv1.jpg"><br>
<span>瞰中国:宁夏</span>
</a><br>
<small>低调的宁夏 美了四季</small>
</li>
<li >
<a href="#">
<img src="static/images/tv2.jpg"><br>
<span>瞰中国:宁夏</span>
</a><br>
<small>低调的宁夏 美了四季</small>
</li>
<li>
<a href="#">
<img src="static/images/tv3.jpg"><br>
<span>瞰中国:宁夏</span>
</a><br>
<small>低调的宁夏 美了四季</small>
</li>
<li>
<a href="#">
<img src="static/images/tv4.jpg"><br>
<span>瞰中国:宁夏</span>
</a><br>
<small>低调的宁夏 美了四季</small>
</li>
<li>
<a href="#">
<img src="static/images/tv5.jpg"><br>
<span>瞰中国:宁夏</span>
</a><br>
<small>低调的宁夏 美了四季</small>
</li>
</ul>
</div>
</div>
<div class="clear"></div>
</div>
</body>点击 "运行实例" 按钮查看在线实例
a边框占像素，设置的时候要进行调整，不然达不到满意效果；
b有时候元素需要进行转化，才能对其进行约束，这个要自己把握，多联系；
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