It depends how your current style did those boxes. For example, I put mine in additional css, and just use class to assign the css, like this:
Code:
<if condition="$post['field6']"><div class="pbit" align="center">Gender: $post[field6]</div></if>
If your postbit legacy template is done similarly and you found the css name in additional css definitions, try changing your post_thanks_postbit_info template to:
Code:
<if condition="$post[userid]">
<div class="BOXESCSSNAME">$vbphrase[post_thanks_thanks]: $post[post_thanks_user_amount_formatted]</div>
<div class="BOXESCSSNAME">
<if condition="$post[post_thanks_thanked_times] == 1">
$vbphrase[post_thanks_time_post]
<else />
<if condition="$post[post_thanks_thanked_posts] == 1">
<phrase 1="$post[post_thanks_thanked_times_formatted]">$vbphrase[post_thanks_times_post]</phrase>
<else />
<phrase 1="$post[post_thanks_thanked_times_formatted]"
2="$post[post_thanks_thanked_posts_formatted]">$vbphrase[post_thanks_times_posts]</phrase>
</if>
</if>
</div>
</if>