在这个例子中: http://jsfiddle.net/vGAm6/
<table style="width: 100%;border-collapse: collapse;">
<tr class="top-padding" style="height: 64px; width: 100%;"></tr>
<tr class="content" style="width: 100%;">
<td class="content-container" style="padding: 0;">
<table class="content" style="width: 600px; margin: auto; border-collapse: collapse;">
<tr class="header" style="background-color: black;">
<td style="padding: 0; width: 96px;"><img src="http://f.cl.ly/items/0j0j1K3m2I413t3U1533/1389661583_bird_twitter_new_square.png" style="width:64px; height: 64px;"/></td>
<td style="padding: 0; color: white; font-weight: lighter; vertical-align: middle; font-size: 32px;">Cool Beans</td>
</tr>
</table>
</td>
</tr>
</table>
图像下方有一个突出的4px
填充。我怎么能让它消失?