What?? I don't think you understood their question. Those are the styles when you check a box in the inline moderation. If arindra wants to do it they can make their own class and call it whatever they want.
Real quick example I did:
Style code:
HTML Code:
<style type="text/css">
td.active:hover{
background-color: #333366;
}
</style>
HTML:
HTML Code:
<table>
<tr>
<td>
Doesn't change on hover
</td>
<td class="active">
Changes on hover
</td>
</tr>
</table>