Old fashioned checkbox hack?

I have a challenge and could use some help. I am styling a form where I don't have control over the HTML, which is written in a outdates way. I am making the CSS file. The form has a checkbox that appears ridiculously small and I have not been successful in changing its appearance. Urgently in need to help with this. I need to fix it tonight!

Here is the html:

<td class="data">
<input id="dn_new[77][XINFO12]" name="dn_new[77][XINFO12]" class="data" value="0" type="checkbox" visibility="hidden">

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