CSS 【2018.12.01】

<!DOCTYPE html>
<html>
<head>
  <title>下拉菜单实例</title>
  <meta charset="gbk"/>
  <style type="text/css">
    .dropbtn{
      background-color:#4CAF50;
      color:white;
      padding:16px;
      font-size:16px;
      border:none;
      cursor:pointer;
    }

    .dropdown{
      position:relative;
      display:inline-block;
    }

    .dropdown-content{
      display:none;
      position:absolute;
      right:0;
      background-color:#f9f9f9;
      min-width:160px;
      box-shadow:0px 8px 16px 0px rgba(0,0,0,0.2);
    }
    
    .dropdown-content a{
      color: black;
      padding:12px 16px;
      text-decoration:none;
      display:block;
    }

    .dropdown-content a:hover{ background-color:#f1f1f1 }

    .dropdown:hover .dropdown-content{
      display:block;
    }

    .dropdown:hover .dropbtn{
      background-color:#3e8e41;
    }
  </style>
</head>
<body>
   <h2>下拉内容的对齐方式</h2>
   <p>left 和 right 属性指定了内容是从左到右或从右到左</p>
   <div class="dropdown" style="float:left">
     <button class="dropbtn">左</button>
     <div class="dropdown-content" style="left:0;">
       <a href="#">12312 1 </a>
       <a href="#">12312 1 </a>
       <a href="#">12312 1 </a>
     </div>
   </div>

   <div class="dropdown" style="float:right">
     <button class="dropbtn">右</button>
     <div class="dropdown-content">
       <a href="#">12312 1 </a>
       <a href="#">12312 1 </a>
       <a href="#">12312 1 </a>
     </div>
   </div>
</body>
</html>
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