请老师帮忙看下，代码是否可优化？

来源：2-7 编程练习

qq_happy

2019-04-25 10:13:24

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
        body {
            margin: 0;
            padding: 0;
            font-size: 20px;
        }

        a {
            color: #fff;
            text-decoration: none;
        }

        ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .header {
            background: #000;
            height: 100px;
            overflow: hidden;
            position: fixed;
            top: 0;
            width: 100%;
        }

        .nav-list {
            float: right;
            padding-right: 40px;
        }

        .nav-list li {
            display: inline-block;
            line-height: 100px;
            padding: 0 20px;
        }

        .content {
            margin-top: 100px;
            margin-bottom: 100px;
        }

        .content img {
            display: block;
            margin: 0 auto;
            width: 100%;
        }

        .container {
            width: 1100px;
            margin: 0;
        }

        .footer {
            position: fixed;
            bottom: 0;
            width: 100%;
            background-color: #000;
            height: 100px;
        }

        .footer .nav-list {
            float: inherit;
            text-align: center;
        }

        /*此处写代码*/

    </style>
</head>

<body>
    <!-- 此处写代码 -->
    <div class="header">
        <img class="logo" src="http://climg.mukewang.com/58c0d2d900016ce303000100.png">
        <ul class="nav-list">
            <li><a href="#">课程</a></li>
            <li><a href="#">职业路径</a></li>
            <li><a href="#">实战</a></li>
            <li><a href="#">猿问</a></li>
            <li><a href="#">手记</a></li>
        </ul>
    </div>
    <div class="content">
        <img src="http://climg.mukewang.com/58c0eda50001e12416000480.jpg">
        <img src="http://climg.mukewang.com/58c0edb80001c9f216000480.jpg">
        <img src="http://climg.mukewang.com/58c0edc9000100d516000480.jpg">
    </div>
    <div class="footer">
        <ul class="nav-list">
            <li><a href="#">网站首页</a></li>
            <li><a href="#">企业合作</a></li>
            <li><a href="#">人才招聘</a></li>
            <li><a href="#">联系我们</a></li>
            <li><a href="#">常见问题</a></li>
            <li><a href="#">友情链接</a></li>
        </ul>
    </div>
</body>

</html>

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