WEB-五彩导航添加定位

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    a{
      text-decoration: none;
    }
    #a1{
      display: inline-block;
      width: 120px;
      height: 58px;
      background-image: url("../images/images/bg1.png");
      text-align: center;
      line-height: 58px;
    }
    #a2{
      display: inline-block;
      width: 120px;
      height: 58px;
      background-image: url("../images/images/bg2.png");
      text-align: center;
      line-height: 58px;
    }
    #a3{
      display: inline-block;
      width: 120px;
      height: 58px;
      background-image: url("../images/images/bg3.png");
      text-align: center;
      line-height: 58px;
      position: relative;
    }
    #a3 img{
      display: none;
      position: absolute;
      bottom: -130px;
      left: 0px;
    }
    #a4{
      display: inline-block;
      width: 120px;
      height: 58px;
      background-image: url("../images/images/bg4.png");
      text-align: center;
      line-height: 58px;
    }
    #a1:hover{
      background-image: url("../images/images/bg5.png")
    }
    #a2:hover{
      background-image: url("../images/images/bg6.png")
    }
    #a3:hover{
      background-image: url("../images/images/bg7.png")
    }
    #a3:hover img{
      display: block
    }
    #a4:hover{
      background-image: url("../images/images/bg8.png")
    }
  </style>
</head>
<body>
  <a href="#" id="a1">五彩导航</a>
  <a href="#" id="a2">五彩导航</a>
  <a href="#" id="a3">五彩导航 <img src="../images(1)(1)/images/code.jpg" alt=""></a>
  <a href="#" id="a4">五彩导航</a>
</body>
</html>
实现场景：
文章来源地址https://uudwc.com/A/DzX2a