Javascript for adding a class to Woocommerce extra information fields

I’m trying to add a style to each cell on the additional information fields for woocommerce products on site

http://hospedefacil.net/curio/?product=anilha-1410-honda-teste

It should style the “Informação Adicional” tab.

Some user had send me this

<script type="text/javascript">
jQuery(function($) {
var i = 0;
$('.shop_attributes tbody tr').each(function() {
$(this).addClass('addi_row_' + i);
});
});
</script>

It’s almost working, but adding a style to each line instead cell, and the counting is not working. Any idea where the bug on the script is? Thanks a lot!