firefox and chrome shows different

-- url of the page with the problem -- : mywebsite.com/mypage
-- HikaShop version -- : x.x.x
-- Joomla version -- : x.x
-- PHP version -- : x.x.x
-- Browser(s) name and version -- : XXXXX x.x.x
-- Error-message(debug-mod must be tuned on) -- : Error_message

www.adrialle-cadeau.com
latest versions

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On product page the line "in stock" is showing different in chrome (my browser) goed, but in firefox behind "add to basket" button, than it can not be seen.
Why?

I wanted more space between and I added this code in css "hikashop_ product_stock_count": margin-top: 20px and margin-bottom: 20px. and little bit customized the background.

Vero