请问如何实现table的外框和内框线的粗度不同？？
我只能实现粗度相同
.TABLE_ATENA {
border-collapse: collapse;
border-spacing: 0;
empty-cells: show;
display: block;
padding: 0px;
margin: 0px;
border:solid;
border-width:1px 0px 0px 1px;
}
.TABLE_ATENA TH {
text-align: center;
border:solid;
border-width:0px 1px 1px 0px;
padding-left:10px;
}
.TABLE_ATENA TD {
text-align: left;
border:solid;
border-width:0px 1px 1px 0px;
padding-left:10px;
}
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>xxxx</title>
<style type="text/css">
table{border:2px solid red;border-collapse: collapse; border-spacing: 0;}
td{border:1px solid red;}
</style>
</head>
<body>
<table>
<tr>
<td>11</td><td>12</td>
</tr>
<tr>
<td>21</td><td>22</td>
</tr>
</table>
</body>
</html>