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博客园

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <link rel="stylesheet" type="text/css" href="boke.css"/>
    </head>
    <body>
        <header class="header">
        <a href="#" class="header-logo"><img src="img/index/logo.svg"/></a>
        <div class="container header-nav">
            <div class="header-subnav-btn">
                分类
                <ul class="header-subnav">
                    <li><a href="#">NET技术</a></li>
                    <li><a href="#">编程语言</a></li>
                    <li><a href="#">软件设计</a></li>
                    <li><a href="#">Web前端</a></li>
                    <li><a href="#">手机开发</a></li>
                    <li><a href="#">数据库技术</a></li>
                    <li><a href="#">操作系统</a></li>
                    <li><a href="#">其他</a></li>
                </ul>
            </div>
   
            <ul class="header-navbar">
                <li class="active"><a href="#">首页</a></li>
                <li>
                    <a href="#">新闻</a>
                    <ul class="header-subnavbar">
                        <li><a href="#">a</a></li>
                        <li><a href="#">b</a></li>
                        <li><a href="#">c</a></li>
                        <li><a href="#">d</a></li>
                        <li><a href="#">e</a></li>
                        <li><a href="#">f</a></li>
                        <li><a href="#">g</a></li>
                        <li><a href="#">h</a></li>
                    </ul>
                </li>
                <li>
                    <a href="#">博问</a>
                    <ul class="header-subnavbar">
                        <li><a href="#">a</a></li>
                        <li><a href="#">b</a></li>
                        <li><a href="#">c</a></li>
                        <li><a href="#">d</a></li>
                    </ul>
                </li>
                <li>
                    <a href="#">闪存</a>
                    <ul class="header-subnavbar">
                        <li><a href="#">a</a></li>
                        <li><a href="#">b</a></li>
                        <li><a href="#">c</a></li>
                        <li><a href="#">d</a></li>
                    </ul>
                </li>
                <li>
                    <a href="#">小组</a>
                    <ul class="header-subnavbar">
                        <li><a href="#">a</a></li>
                        <li><a href="#">b</a></li>
                        <li><a href="#">c</a></li>
                        <li><a href="#">d</a></li>
                        <li><a href="#">e</a></li>
                    </ul>
                </li>
                <li><a href="#">收藏</a></li>
                <li><a href="#">招聘</a></li>
                <li><a href="#">精华</a></li>
            </ul>
        
            <div class="header-search">
                <input type="text" name="keywords" id="Search-input" placeholder="搜索" autocomplete="off"/>
                
            </div>
            
            <div class="login-hds">
                <div id="zxc">
                    <a class="login-btn-hd" href="#" id="link">Ben涧の芽衣子</a>
                    <a class="register-btn-hd" href="#" id="re">我的博客</a>
                    <a class="register-btn-hd" href="#" id="re">退出</a>
                </div>
            </div>
        </div>
           </header>
    </body>
</html>

* {
    margin: 0;
    padding: 0;
}

body {
       width: 100%;
    font-size: 12px;
    position: absolute;
    
}


.container {
    width: 1180px;
    margin: 0 auto;
    max-width: 1920px;
}

ul {
    list-style: none;    
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
a {
    text-decoration: none;
    color: #212b34;
    background-color: transparent;
    box-sizing: border-box;
}

/*头部*/
.header {
    position: absolute;
    z-index: 1;
    box-shadow: 0 1px 5px 0 rgba(33,43,52,.1);
    width: 100%;
    top: 0;
    background-color: #FFFFFF;
}

.header .header-logo {
    position: relative;
    display: block;
    width: 245px;
    height: 80px;
    margin: 0 auto;
    overflow: hidden;
    text-align: center;
}

.header-logo>img {
    margin: 20px auto;
}

.header-nav {
    position: relative;
    height: 50px;
}

.iconfont {
    font-family: 'icomoon';
    font-size: 16px;
    font-style: normal;
    margin-left: 5px;
}

.header-subnav-btn {
    position: absolute;
    left: 0;
    top: 0;
    display: block;
    width: 170px;
    height: 50px;
    line-height: 50px;
    text-align: center;
    color: #fff;
    font-size: 20px;
    background-color: #027cdb;
    opacity: 1;
}

.header-subnav {
    z-index: 2;
    position: absolute;
    width: 170px;
    top: 50px;
    visibility: hidden;
}

.header-subnav>li {
    display: block;
    height: 50px;
    line-height: 50px;
    text-align: center;
    font-size: 14px;
    background-color: #025fa8;
    border-bottom: 1px solid hsla(0,0%,100%,.2);
}

.header-subnav>li>a {
    /*display: block;*/
    color: #fff;
}

.header-subnav>li:hover{
    background-color: #01518f;
}


.header-subnav-btn:hover .header-subnav{
    opacity: 1;
    visibility: inherit
}

.header-navbar {
    margin-left: 200px;
}

.header-navbar>li {
    display: inline-block;
    padding: 0 15px;
    line-height: 50px;
    font-size: 14px;
    position: relative;
    vertical-align: top;
}

.header-navbar>li a:hover{
    color: #0097e6;
}

.header .active>a{
    color: #73b2fc;
    padding-bottom: 4px;
    border-bottom: 2px solid #73b2fc
}

.header-navbar>li>a {
    color: #212b34;
}

.header-navbar>li .header-subnavbar{
    position: absolute;
    box-shadow: 0 0 10px rgba(0,0,0,.08);
    background-color: #fff;
    text-align: left;
    border-radius: 0 0 4px 4px;
    width: 100px;
    transition: all .2s ease-in-out;    
    top: 100%;
    opacity: 0;
    padding: 6px 0;
    visibility: hidden;
}

.header-navbar>li .header-subnavbar a {
    padding: 0 20px;
    font-size: 12px;
    line-height: 40px;
    display: block;
    color: #525a67;
    white-space: nowrap;
    transition: all .2s ease-in-out;
}

.header-navbar>li:hover .header-subnavbar{
    opacity: 1;
    visibility: inherit;
}

.header-subnavbar>li>a:hover{
    color: white;
    background-color: #025fa8;
}

.header-search {
    position: absolute;
    right: 0;
    bottom: 14px;
    padding-right: 18px;
    width: 250px;
    height: 25px;
    border-bottom: 1px solid #73b2fc;
}

#Search-input {
    border: none;
    width: 100%;
    line-height: 2.5;
    font-size: 12px;
    color: #212b34;
    outline: none;
    background-color: inherit;
}

input::-webkit-input-placeholder {
    color: #0097E6;
}

.login-hds {
    position: absolute;
    right: 0;
    top: 0;
    /* 300px;*/
    margin-top: -67px;
}

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原文地址：https://www.cnblogs.com/bk134/p/12889647.html