摘要：<!DOCTYPE html><html><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv=&
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<style>
* {
margin: 0;
padding 0;
}
.header {
width: 100%;
height: 160px;
}
.header .logo {
margin: 0 auto;
width: 1200px;
height: 110px;
background-color: lightcoral;
}
.header .nav {
width: 100%;
height: 50px;
background-color: #029cff;
}
.header .nav .nav2 {
margin: 0 auto;
padding: 0;
width: 1200px;
}
.header .nav .item {
float: left;
width: 120px;
list-style: none;
line-height: 50px;
text-align: center;
color: #fff;
}
.header .nav .item:hover {
margin: 0 auto;
background-color: #fff;
color: #000;
}
.header .nav .item .nav3 {
display: none;
list-style: none;
border-left: 1px solid lightblue;
border-right: 1px solid lightblue;
border-bottom: 1px solid lightblue;
}
.header .nav .item:hover .nav3 {
width: 118px;
display: block;
background-color: #029cff;
padding-left: 0;
color: #fff;
}
.header .nav .item .nav3 .item2:hover {
background-color: #fff;
color: #000;
}
.clear {
clear: both;
}
.banner {
width: 100%;
height: 400px;
background-color: lightblue;
margin-top: 0px;
}
.container {
width: 1200px;
height: 268px;
margin: 30px auto;
}
.box {
float: left;
width: 276px;
height: 268px;
background-color: aqua;
}
.box1 {
float: left;
margin-left: 32px;
width: 276px;
height: 268px;
background-color: red;
}
.box2 {
float: left;
margin-left: 32px;
width: 276px;
height: 268px;
background-color: #000;
}
.box3 {
float: left;
margin-left: 32px;
width: 276px;
height: 268px;
background-color: lightcoral;
}
.footer {
width: 100%;
height: 100px;
background-color: #029cff;
}
.footer .content {
font-size: 18px;
text-align: center;
line-height: 100px;
color: #fff;
}
</style>
<title>我的站点</title>
</head>
<div class="header">
<div class="logo"></div>
<div class="nav">
<ul class="nav2">
<li class="item">网站首页</li>
<li class="item">关于我们
<ul class="nav3">
<li class=item2>公司简介</li>
<li class=item2>领导介绍</li>
</ul>
</li>
<li class="item">新闻中心</li>
<li class="item">产品介绍</li>
<li class="item">工程案例</li>
<li class="item">售后服务</li>
<li class="item">人才招聘</li>
<li class="item">在线留言</li>
<li class="item">销售网络</li>
<li class="item">联系我们</li>
</ul>
</div>
</div>
<div class="clear"></div>
<div class="banner"></div>
<div class="container">
<div class="box"></div>
<div class="box1"></div>
<div class="box2"></div>
<div class="box3"></div>
</div>
<div class="clear"></div>
<div class="footer">
<div class="content">这个是我的站点</div>
</div>
<body>
</body>
</html>
批改老师：天蓬老师批改时间：2019-01-23 08:59:17
老师总结：<div class="clear"></div>, 这种清浮动, 实际上用得并不多, 因为他会多增加一个dom元素, 可以用伪类:after来实现,更方便
