Adding borders to product contact page fields

I'd like to add borders on the product contact page fields but I can't seem to find the right class to define this in? Any suggestions on where to look?

I found a solution and it's fine now

.hikashop_product_contact_page input{
border: 1px solid #CCC;
}

.hikashop_product_contact_page textarea{
border: 1px solid #CCC;
}