Front-end basic knowledge learning - sliding door (navigation bar application) thirteen

insert image description here
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body,
        ul {
      
      
            margin: 0;
            padding: 0;
        }

        li {
      
      
            list-style: none;
        }

        a {
      
      
            text-decoration: none;
        }

        body {
      
      
            background: #23232f;
            padding: 50px;
        }

        /*元素宽度由内容撑开
        display:inline  ——内嵌 不支持宽度

         display:inline-block  ——不支持块标签

         float   ——浮动

         position:absolute ——需要给每个元素设置坐标

         position:fixed   ——存在不兼容问题
       */
        /* 宽度跟着父级  高度由子级决定 */
         

        .nav {
      
      
            background: #0f0f14 url(img/navL.png) no-repeat;
            float: left;
        }
        .navR{
      
      background: url(img/navR.png) no-repeat right 0;float: left;padding: 4px 4px 0 3px;}
        .navR li{
      
      float: left;padding-left: 1px;}
        .nav a{
      
      float: left;background: url(img/btn2.png) no-repeat;}
        .nav  span{
      
      float: left;background: url(img/btnR.png) no-repeat right 0; height: 31px;font-size: 14px;line-height: 30px;color: #fff;padding: 0 18px;}
        .nav a:hover {
      
       background-image: url(img/hoverA.png);}
        .nav a:hover span {
      
      background-image: url(img/hoverR.png);}
  </style>
</head>

<body>
   

    <div class="nav">
        <ul class="navR">
            <li>
                <a href="#" >
                    <span>心理</span>
                </a>
            </li>
            <li>
                <a href="#">
                    <span>科技</span>
                </a>
            </li>
            <li>
                <a href="#">
                    <span>历史</span>
                </a>
            </li>
            <li>
                <a href="#" class="active">
                    <span>数理</span>
                </a>
            </li>
            <li>
                <a href="#">
                    <span>文史</span>
                </a>
            </li>
        </ul>
    </div>
</body>

</html>
Front-end basic knowledge learning - sliding door (navigation bar application) thirteen

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