* {
        margin: 0;
        padding: 0;
    }
    
    .w {
        width: 1200px;
        margin: auto;
    }
    
    body {
		font-family: 'Times New Roman', "Microsoft YaHei";
        background-color: #f3f5f7;
        min-height: 20px;
        position: relative;
    }
    
    li {
        list-style: none;
    }
    
    a {
        text-decoration: none;
    }
    
    .clearfix:before,
    .clearfix:after {
        content: "";
        display: table
    }
    
    .clearfix::after {
        clear: both;
    }
    
    .clearfix {
        *zoom: 1;
    }
    
    .header {
        height: 42px;
        /* 此处会层叠w里面的margin */
        margin: 40px auto;
    }
    
    .logo {
        float: left;
        width: 198px;
        height: 42px;
    }
    
    .nav {
        float: left;
        margin-top: 15px;
        margin-left: 60px;
    }
    
    .nav ul li {
        float: left;
        margin: 0 15px;
    }
    
    .nav ul li a {
        display: block;
        height: 42px;
        padding: 0 10px;
        line-height: 42px;
        font-size: 18px;
        color: #050505;
    }
    
    .nav ul li a:hover {
        border-bottom: 2px solid #00a4ff;
    }
    /* search 搜索模块 */
    
    .search {
        float: left;
        width: 412px;
        height: 42px;
        background-color: skyblue;
        margin-top: 15px;
        margin-left: 70px;
    }
    
    .search input {
        float: left;
        width: 345px;
        height: 40px;
        border: 1px solid #00a4ff;
        border-right: 0;
        color: #bfbfbf;
        font-size: 14px;
        padding-left: 15px;
    }
    
    .search button {
        float: left;
        width: 50px;
        height: 42px;
        /* 按钮 button 默认有个边框，需要我们手动去掉 */
        border: 0;
        background: url(../images/button.png);
    }
    
    .user {
        float: right;
		height: 42px;
        line-height: 42px;
        margin-top: 15px;
        margin-right: 30px;
        font-size: 14px;
        color: #666;
    }
    /* 图标与文字对齐 */
    
    .user img {
        vertical-align: middle;
    }
    /* banner 区域 */
    
    .banner {
        height: 421px;
        background-color: #1c036c;
    }
    
    .banner .w {
        height: 421px;
        background: url(../images/banner2.png) no-repeat top center;
		-webkit-background-size: cover;
        -o-background-size: cover;                
        background-size: cover;
    }
    
    .subnav {
        float: left;
        width: 190px;
        height: 421px;
        background-color: rgba(0, 0, 0, 0.3);
    }
    
    .subnav ul li {
        height: 45px;
        line-height: 45px;
        padding: 0 20px;
    }
    
    .subnav ul li a {
        font-size: 14px;
        color: #fff;
    }
    
    .subnav ul li a span {
        float: right;
    }
    
    .subnav ul li a:hover {
        color: #00a4ff;
    }
    
    .course {
        float: right;
        width: 230px;
        height: 20vh;
        background-color: #fff;
        /* 浮动的盒子不会有外边距合并的问题 */
        margin-top: 50px;
    }
    
    .course h2 {
        height: 48px;
        background-color: #9bceea;
        text-align: center;
        line-height: 48px;
        font-size: 18px;
        color: #fff;
    }
    
    .bd {
        padding: 0 20px;
    }
    
    .bd ul li {
        padding: 14px 0;
        border-bottom: 1px solid #ccc;
    }
    
    .bd ul li h4 {
        font-size: 16px;
        color: #4e4e4e;
    }
    
    .bd ul li p {
        font-size: 12px;
        color: #a5a5a5;
    }
    
    .bd .more {
        display: block;
        height: 38px;
        border: 1px solid #00a4ff;
        margin-top: 5px;
        text-align: center;
        line-height: 38px;
        color: #00a4ff;
        font-size: 16px;
        font-weight: 700px;
    }
    /* goods 精品推荐模块 */
    
    .goods {
        height: 60px;
        background-color: #fff;
        margin-top: 10px;
        box-shadow: 0 2px 3px 3px rgba(0, 0, 0, 0.1);
        /* 行高会继承，继承给三个孩子 */
        line-height: 60px;
    }
    
    .goods h3 {
        float: left;
        margin-left: 30px;
        font-size: 16px;
        color: #00a4ff;
    }
    
    .goods ul {
        float: left;
        margin-left: 30px;
    }
    
    .goods ul li {
        float: left;
    }
    
    .goods ul li a {
        padding: 0 30px;
        font-size: 16px;
        color: #050505;
        border-left: 1px solid #ccc;
    }
    
    .goods .mod {
        float: right;
        margin-right: 30px;
        font-size: 14px;
        color: #00a4ff;
    }
    
    .box {
        margin-top: 30px;
    }
    
    .box-hd {
        height: 45px;
    }
    
    .box-hd h3 {
        float: left;
        font-size: 20px;
        color: #494949;
    }
    
    .box-hd a {
        float: right;
        font-size: 12px;
        color: #a5a5a5;
        margin-top: 10px;
        margin-right: 30px;
    }
    /* 把 li 的父亲 ul 修改的足够宽，一行能装下五个盒子就不会换行了 */
    
    .box-bd ul {
        width: 1225px;
    }
    
    .box-bd ul li {
        float: left;
        width: 228px;
        min-height: 300px;
        background-color: #fff;
        margin-right: 15px;
        margin-bottom: 15px;
    }
    
    .box-bd ul li img {
		margin: 20px 20px 20px 20px;
        heigth: 100%;
    }
    
    .box-bd ul li h4 {
        margin: 0px 20px 20px 20px;
        font-size: 14px;
        color: #050505;
        font-weight: 400;
    }
    
    .box-bd .info {
        margin: 0 20px 20px 20px;
        font-size: 12px;
        color: #999;
    }
    
    .box-bd .info span {
        color: #ff7c2d;
    }
    /* footer 模块区域 */
    
    .footer {
        margin-top: 20px;
        height: 315px;
        background-color: #fff;
    }
    
    .footer .w {
        padding-top: 35px;
    }
    
    .footer .left {
        float: left;
    }
    
    .footer .left p {
        font-size: 12px;
        color: #666;
        margin: 20px 0 15px 0;
    }
    
    .footer .left a {
        display: block;
        width: 118px;
        height: 33px;
        border: 1px solid #00a4ff;
        text-align: center;
        line-height: 33px;
        font-size: 16px;
        color: #00a4ff;
    }
    
    .footer .right {
        float: right;
    }
    
    .footer .right dl {
        float: left;
        margin-left: 100px;
    }
    
    .footer .right dl dt {
        font-size: 16px;
        color: #333;
        margin-bottom: 5px;
    }
    
    .footer .right dl dd a {
        font-size: 12px;
        color: #333;
    }