[SOLVED} Change width of product volume fields

-- HikaShop version -- : 2.6.0
-- Joomla version -- : 3.4.8
-- PHP version -- : 5.4.29

I am trying to increase the width of the product volume fields on the product edit page but can't find where to do it. Could you point me in the right direction please?

I managed to correct it with:

.hikamarket_product_volume input {
	width:80px!important;    
}