table显示内边框

今天做个表格，需要显示黑体内边框，弄了半天弄不出来，怒了！直接拼揍

<title>无标题文档</title>
<style type="text/css">
	table{ border-top:black 1px solid; border-left:black 1px solid;}
	table td{ border-bottom:black 1px solid; border-right:black 1px solid;}
</style>
</head>
<body>
<table width="500px" height="200px" cellpadding="0" cellspacing="0">
	<Tr>
    	<Td>fd</Td>
        <Td>fd</Td>
        <Td>fd</Td>
    </Tr>
    <Tr>
    	<Td>fd</Td>
        <Td>fd</Td>
        <Td>fd</Td>
    </Tr>
</table>
</body>

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