With only one font-family? And it’s Arial? The nerve!
<td class=bubble rowspan=2 style="font-family:arial;text-align:left;font-weight:bold;padding:5 0"><b>Celebrating 5 years of Gmail</b></td>I don’t have Arial installed, so this shows up as my default serif, because they don’t even bother to include the generic ‘sans-serif’ font-family.