<style>
        * {
            margin: 0;
            padding: 0;
        }

        /* 头部 */
        header {
            display: flex;
            width: 100%;
            height: 80px;
            justify-content: space-around;
            background-color: #000;
        }

        .logo {
            display: flex;
            height: 100%;
            justify-content: center;
            align-items: center;
        }
        .logo  img{
            height: 80px;
            vertical-align: middle;
        }
        .nav {
            display: flex;
            width: 40%;
        }
        li {
            list-style: none;
            font-size: 24px;
            color: #fff;
            display: flex;
            flex: 1;
            align-items: center;
            justify-content: center;
        }
        .login {
            display: flex;
            width: 160px;
            align-items: center;
            justify-content: space-around;
        }

        .login input {
            display: flex;
            justify-content: center;
            align-items: center;
            width: 50px;
            height: 40px;
            background-color: rgb(246, 166, 18);
            border: none;
            color: #fff;
            font-size: 16px;
            border-radius: 10px;
        }
        /* 主体内容 */
        section {
            display: flex;
            flex-wrap: wrap;
            width: 100%;
            justify-content: space-around;
        }
        .section {
            display: flex;
            width: 40%;
            height: 180px;
            background-color: rgb(162, 217, 254);
            justify-content: space-around;
            align-items: center;
            margin-top: 40px;
            border-radius: 10px;
        }
        .section .box div{
            margin-top: 20px;
        }
        .shopping{
            display: flex;
            background-color: rgb(235, 166, 37,.9);
            width: 100px;
            height: 40px;
            justify-content: center;
            align-items: center;
            font-size: 16px;
            color: #fff;
            border: none;
            border-radius: 10px;
        }
    </style>

<!-- 头部 -->
    <header>
        <div class="logo">
            <img src="http://climg.mukewang.com/59197ab000014f1503000100.jpg" alt="">
        </div>
        <ul class="nav">
            <li>课程</li>
            <li>路径</li>
            <li>猿问</li>
            <li>手记</li>
        </ul>
        <div class="login">
            <input type="button" value="登录">
            <input type="button" value="注册">
        </div>
    </header>
    <!-- 主体内容 -->
    <section>
        <div class="section">
            <div class="box">
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            </div>
            <div class="shopping">
                <div class="btn">加入购物车</div>
            </div>
        </div>
        <div class="section">
            <div class="box">
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            <div class="shopping">
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            </div>
        </div>
        <div class="section">
            <div class="box">
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            </div>
            <div class="shopping">
                <div class="btn">加入购物车</div>
            </div>
        </div>
        <div class="section">
            <div class="box">
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            </div>
            <div class="shopping">
                <div class="btn">加入购物车</div>
            </div>
        </div>
    </section>