/* index.css是用来美化首页的 */
* {
    margin: 0;
    padding: 0;
    /* 內减模式 */
    box-sizing: border-box;
}

li {
    list-style: none;
}
a {
    text-decoration: none;
}

.clearfix:before,.clearfix:after {
    content:"";
    display:table; 
  }
  .clearfix:after {
    clear:both;
  }



body{
    background-color: #f3f5f7;
}

.wrapper{
    width: 1200px;
    margin: 0 auto;
}
.header{
    height: 42px;
    background-color: pink;
    margin: 30px;
}
h1 {
    float: left;
}

/* 导航 */
.nav {
    float: left;
    margin-left: 70px;
    height: 42px;
}
.nav li{
    float: left; 
    margin-right: 26px;
   
}
.nav li a{
    display: block;
    padding: 0 9px;
    height: 42px;
    line-height: 42px;
   
}
.nav li a:hover{
    border-bottom: 2px solid #00a4ff;
}
/* 搜索 */
.search {
    float: left;
    margin-left: 59px;
    width: 412px;
    height: 40px;
    border: 1px solid #00a4ff;
}

.search input {
    float: left;
    padding-left: 20px;
    /* 左右加一起的尺寸要小于等于410 */
    width: 360px;
    height: 38px;
    border: 0;
}

/* 控制placeholder的样式 */
.search input::placeholder {
    font-size: 14px;
    color: #bfbfbf;
}

.search button {
    float: left;
    width: 50px;
    height: 40px;
    background-image: url(../images/btn.png);
    border: 0;
}
.user{
    float: right;
    margin-right: 35px;
    height: 42px;
    line-height: 42px;
}
.user img{
    vertical-align: middle;
}

/* 轮播图 */
.banner {
    height: 420px;
    background-color: #1c036c;
}

.banner .wrapper {
    height: 420px;
    background-image: url(../images/banner2.png);
}
.banner .left {
    float: left;

    padding: 0 20px;

    width: 190px;
    height: 420px;
    background-color: rgba(0,0,0, 0.3);

    /* 行高属于控制文字的属性, 能继承 */
    line-height: 44px;
}
.banner .left span{
    float:right;
}
.banner .left a {
    font-size: 14px;
    color: #fff;
}

.banner .left a:hover {
    color: #00b4ff;
}


.banner .right {
    float: right;
    margin-top: 50px;
    width: 228px;
    height: 300px;
    background-color: #fff;
}
.banner .right h2 {
    height: 48px;
    background-color: #9bceea;
    text-align: center;
    line-height: 48px;
    font-size: 18px;
    color: #fff;
}
.banner .right .content {
    padding: 0 18px;
}

.banner .right .content dl {
    padding: 12px 0;
    border-bottom:2px solid #e5e5e5;
}

.banner .right .content dt {
    font-size: 16px;
    color: #4e4e4e;
}

.banner .right .content dd {
    font-size: 14px;
    color: #4e4e4e;
}
.banner .right .more {
    display: block;
    /* margin: 4px 14px 0; */
    margin: 4px auto 0;
    width: 200px;
    height: 40px;
    border: 1px solid #00a4ff;

    font-size: 16px;
    color: #00a4ff;
    font-weight: 700;

    text-align: center;
    line-height: 40px;
}
/* 精品推荐 */
.goods {
    margin-top: 8px;
    padding-left: 34px;
    padding-right: 26px;

    height: 60px;
    background-color: #fff;
    box-shadow: 0px 2px 3px 0px 
    rgba(118, 118, 118, 0.2);

    line-height: 60px;

}

.goods h2 {
    float: left;
    font-size: 16px;
    color: #00a4ff;
    font-weight: 400;
}

.goods ul {
    float: left;
    margin-left: 30px;
}

.goods ul li {
    float: left;
}

.goods li a {
    border-left: 1px solid #bfbfbf;
    padding: 0 30px;
    font-size: 16px;
    color: #050505;
}

.goods .xingqu {
    float: right;
    font-size: 14px;
    color: #00a4ff;
}
/* 精品课程 */
.box {
    margin-top: 35px;
}

.box .title {
    height: 40px;
}

.box .title h2 {
    float: left;
    font-size: 20px;
    color: #494949;
    font-weight: 400;
}

.box .title a {
    float: right;
    margin-right: 30px;
    font-size: 12px;
    color: #a5a5a5;
}
.box .content li {
    float: left;
    margin-right: 15px;
    margin-bottom: 15px;
    width: 228px;
    height: 270px;
    background-color: #fff;
    position: relative;
}

.box .content li:nth-child(5n) {
    margin-right: 0;
}

.box .content li h3 {
    padding: 20px;
    font-size: 14px;
    color: #050505;
    font-weight: 400;
}

.box .content li p {
    padding: 0 20px;
    font-size: 12px;
    color: #999;
}

.box .content li span {
    color: #ff7c2d;
}

.box .content li .hot {
    position: absolute;
    right: -4px;
    top: 4px;

}

/* 版权 */
.footer {
    margin-top: 40px;

    padding-top: 30px;

    height: 417px;
    background-color: #fff;
}

.footer .left {
    float: left;
}

.footer .left  p {
    margin: 20px 0 10px;
    font-size: 12px;
    color: #666;
}
.footer .left a {
    display: inline-block;
    width: 120px;
    height: 36px;
    border: 1px solid #00a4ff;
    text-align: center;
    line-height: 36px;
    font-size: 16px;
    color: #00a4ff;
}

.footer .right dl {
    float: left;
    margin-left: 120px;
}

.footer .right {
    float: left;
}

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        <span>lilei</span>
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          </ul>
        </div>
        <div class="right">
          <h2>我是歌谣</h2>
          <div class="content">
            <dl>
              <dt>继续学习 程序语言设计</dt>
              <dd>正在学习-使用对象</dd>
            </dl>
            <dl>
              <dt>继续学习 程序语言设计</dt>
              <dd>正在学习-使用对象</dd>
            </dl>
            <dl>
              <dt>继续学习 程序语言设计</dt>
              <dd>正在学习-使用对象</dd>
            </dl>
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    <!-- 精品推荐 -->
    <div class="goods wrapper">
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        <li><a href="https://www.ctyun.cn/portal/link.html?target=%23">jQuery</a></li>
      </ul>
      <a href="https://www.ctyun.cn/portal/link.html?target=%23" class="xingqu">修改兴趣</a>
    </div>
    <!-- 精品推荐课程 -->
    <div class="box wrapper">
      <div class="title">
        <h2>精品推荐</h2>
        <a href="https://www.ctyun.cn/portal/link.html?target=%23">查看全部</a>
      </div>
      <div class="content clearfix">
        <ul>
          <li>
            <a href="https://www.ctyun.cn/portal/link.html?target=%23">
              <img src="./images/course07.png" alt="" />
              <h3>Think PHP 5.0 博客系统实战项目演练</h3>
              <p><span>高级</span> • 1125人在学习</p>
                            <img src="./images/hot.png" alt="" class="hot">
            </a>
          </li>
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              <img src="./images/course07.png" alt="" />
              <h3>Think PHP 5.0 博客系统实战项目演练</h3>
              <p><span>高级</span> • 1125人在学习</p>
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            </a>
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              <h3>Think PHP 5.0 博客系统实战项目演练</h3>
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