如何使span里面的字在span中居中显示？

Question

q<span style="text-align:center;width:200">text</span>q

Answer 1

试过不行，还有高度也要居中！！！<span style="text-align:center;width:100;height:100;background-color:green;">text</span>

Answer 2

<span style="padding-top:40;text-align:center;width:100;height:100;background-color:green;">text</span>

Answer 3

<span style="text-align:center;width:100;height:100;background-color:green;">
<table align=center width="100%" height="100%" border=0 cellpadding=0 cellspacing=0>
<tr>
<td align=center valign=middle>test</td>
</tr>
</table>
</span>

Answer 4

<span style="width:100;height:100;background-color:green;"><table align=center valign=middle height="99%"><td>aaa</td></table></span>