经典的表格样式

 <style type="text/css">
        #tbList
        {
            border:2px solid #90CBFB;
            width:600px;
            margin:20px auto;
            border-collapse:collapse;
        }
        #tbList th,td
        {
            border:2px solid #90CBFB;
            padding:5px;
            text-align:left;
        }
        #tbAdd
        {
            border:1px solid #000;
            width:300px;
            margin:10px auto;
            background-color:#fff;
            border-collapse:collapse;
            position:absolute;
            left:360px;
           display:none;
        }
        #tbAdd td
        {
            padding:10px;   
         }
         #divShadow
         {
             width:100%;
             height:100%;
             position:absolute;
             left:0px;
             top:0px;
             background-color:Gray;
             opacity:0.7;
             display:none;
         }
    </style>