Style
.lista_op td label {
background: #F8F8FF;
width: 100%;
height: 100%;
display: block;
cursor: pointer;
}
Html
<table>
<tr>
<td>
<label for="del_op_id_1"><input type="checkbox" name="del_op_id[]" id="del_op_id_1" value="1"></label>
</td>
</tr>
</table>