老师请检查，有什么可以优化的地方

来源：2-4 编程练习

keepangry2297447

2020-03-18 10:46:55

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>2-4编程练习</title>
<style>
  *{
   padding: 0;
   margin: 0;
  }
  .nav{
   background: #000;
   width: 1100px;
   height: 100px;
   position: absolute;
   top: 50%;
   left: 50%;
   margin-left: -550px;
   margin-top: -50px;
  }
  ul li,ul{
   list-style: none;
   text-align: center;
   float: right;
   color: #fff;
   line-height: 100px;
   padding: 0 20px
  }
</style>
</head>
<body>
<div class="nav">
  <div>
   <img src="http://climg.mukewang.com/58c0d2d900016ce303000100.png" alt="慕课网">
   <ul>
    <li>课程</li>
    <li>职业路径</li>
    <li>实战</li>
    <li>提问</li>
    <li>猿记</li>
   </ul>
  </div>
</div>
</body>
</html>