Buttons act erratic - change when hoover above

The Storefront template is used to change the look-and-feel of a womans clothing store. They are very happy with the design, but when checking out the buttons have a strange behaviour. When you want to click on the button this button is moving away from the mouse although the click area seems to remain the same.

I installed a fresh copy of Joomla 3.3.3, akeeba backup, JCE, Hikashop Business 2.3.2 (with sample data) and the template Storefront and I am getting the same strange behaviour.
I also installed the gavick-storefront-quickstart-3 (gk_storefront_quickstart_J!3.zip) but than this button behaviour is normal.

What is different and how do I get rid of the strange erratic button behaviour ?

Check it out @ http://winkel.cads.nl (add a product in the cart and go to the checkout)

The problem exist on all pages? I'm asking because I've visited this page » http://winkel.cads.nl/index.php/hikasho ... ini-laptop and there all is fine the button even don't drag when I hover over it.

Well as you can see not on the product page itself. Only on the checkout page.

So could you provide me direct ULR to page where the problem exists?

So could you provide me direct ULR to page where the problem exists?

http://winkel.cads.nl/index.php/hikasho ... g/checkout

Please look at my screencast - http://recordit.co/NvceQw1nWp I really don't see any problem here...

No, not in that screen when you add the product to the cart.... but you do see erratic behaviour when you go to the cart after that and are trying to login and checkout.

You should have clicked on the menu CHECKOUT (http://winkel.cads.nl/index.php/hikasho ... g/checkout) to see the problem !! Can you test that ?

Thanks for your help by adding a override.css to the template with:

input.btn.button.hikashop_cart_input_button { margin: 15px auto 30px auto!important
float: none;
display: block;}

The problem is now solved.

The problem was caused by some styles inheritance, by default in template there is no kind of behaviour in checkout or any other page.