Change the way the radio button look like?

-- HikaShop version -- : 3.08
-- Joomla version -- : 3.8.0
-- PHP version -- : 7.0.28
-- Browser(s) name and version -- : chrome

Hello. I want to change the way the radio button in this page look like Loukou . I want to make it vertical and the title to be on top. how i can do this.can anyone help me.

Hello,

To change the displaying of your product page Characteristics radio buttons, the solution will probably just be to directly use some CSS code :
www.hikashop.com/support/documentation/1...the-display.html#css

Using something like this will probably do the job :

.hikashop_product_characteristics_table label.radio {
    display: block;
}

Can i have same help where i can find this css file to change it. Because i have search and i can find hikashop_product_characteristics_table label.radio. Or i have to write the code my own and if i must where i must write it in order to display my changes.