横向文本框 cursor:pointer 出现手型

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .hide{
            display: none;
        }
        .header{
            background-color: #eeeeee;
            height: 40px;
            width: 600px;
            margin: 0 auto;

        }
        .header .menu{
            float: left;
            border-right: 1px solid black;
            padding: 0 5px;
            line-height: 40px;
            cursor: pointer;
        }
        .content{
            height: 100px;
            border: 1px solid black;
            width: 600px;
            margin: 0 auto;

        }
        .active{
            background-color: #dddddd;
        }

    </style>
</head>
<body>
     <div class="header">
         <div class="menu" a="1">菜单一</div>
         <div class="menu" a="2">菜单二</div>
         <div class="menu" a="3">菜单三</div>
     </div>
     <div class="content">
          <div class="hide" b="1">内容一</div>
          <div class="hide" b="2">内容二</div>
          <div class="hide" b="3">内容三</div>
     </div>
<script src="../jquery-2.12.4.js"></script>
<script>
    $('.menu').click(function () {
        $(this).addClass('active');
        var tag = $(this).attr('a');
        target = '.content [b=' + tag +']';
        $(target).removeClass('hide').siblings().addClass('hide')

    })
</script>
</body>
</html>