You could try changing the HTML, given what the FAQ says about CSS. For instance, change <td bgcolor="#ffffff"><font color="#002BCA" family="Arial" size="1"><small>The Spellweaver</small></font></td> to be <td style="background-color: #ffffff; color: #002BCA; font-family: Arial; font-size: small;">The Spellweaver</td>
If you're still having trouble, either ask the person who made the code to update it to modern tags that aren't deprecated, or just reply here and I can try and fix the rest.
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You could try changing the HTML, given what the FAQ says about CSS. For instance, change
<td bgcolor="#ffffff"><font color="#002BCA" family="Arial" size="1"><small>The Spellweaver</small></font></td>to be
<td style="background-color: #ffffff; color: #002BCA; font-family: Arial; font-size: small;">The Spellweaver</td>If you're still having trouble, either ask the person who made the code to update it to modern tags that aren't deprecated, or just reply here and I can try and fix the rest.