Terms and Conditions checkbox not on same line

-- HikaShop version -- : latest
-- Joomla version -- : latest
-- PHP version -- : latest
-- Browser(s) name and version -- : chrome latest

I went to System->Display->CSS and added this line to the front-end and the back-end:

#hikashop_checkout_terms, #hikashop_checkout_terms_checkbox{ float: left; }

But when I refresh the checkout page, they are still on two different lines.

How to fix this? This should be one line by default, IMO.

Ok, but where do I put the above line and in what CSS file?