Admin Control Panel > Templates > Modify > Forumhome Template set [expand] > forumhome_logincode > set width to the <table> tag or enlarge the max characters in the input fields.
uhm, now I think of it ..
ACP > temps > modify > forumhome temp set > forumhome [edit] and find:
<!-- timezone/login-->
<table cellpadding="2" cellspacing="0" border="0" width="{contenttablewidth}" {tableinvisibleextra} align="center">
<tr valign="top">
<td><smallfont>$timezone</smallfont></td>
<td align="right">$logincode</td>
</tr>
</table>
<!-- /timezone/login -->
and replace the html to fit your needs/.