table#calendar {padding:0px;margin:0px;background:#0F0;}
table#calendar tr th, #calendar tr td {width:42px;margin:0px 1px 0px 0px;padding:0px;text-align:center;line-height:1.5em;background:#eee;}
table#calendar tr {margin:0px 0px 1px 0px;padding:0px;}
table#calendar tr th.sun, #calendar tr td.sun {margin:0px;}

<table id="calendar">
	<tr>
		<th scope="col">Mo</th>
		<th scope="col">Tu</th>
		<th scope="col">We</th>
		<th scope="col">Th</th>
		<th scope="col">Fr</th>
		<th scope="col">Sa</th>
		<th scope="col" class="sun">Su</th>
	</tr>
	<tr>
		<td>1</td>
		<td>2</td>
		<td>3</td>
		<td>4</td>
		<td>5</td>
		<td>6</td>
		<td class="sun">7</td>
	</tr>
	<tr>
		<td>8</td>
		<td>9</td>
		<td>10</td>
		<td>11</td>
		<td>12</td>
		<td>13</td>
		<td class="sun">14</td>
	</tr>
</table>