Pop cart (cart layer) shows too low runs off monitor screen

[cnpark70]

I am using version 1.0.6.14 default-bootstrap theme.

When you add an item to cart, there pops up a cart box showing Product successfully added to your shopping cart.

Here is the problem, the pop up box shows up too far low so it runs off screen..

It becomes worse when you scroll down to add product in 2nd row and below. The pop up box positioned so low that it is completely out of screen.

 

How can I move up the order congratulation box (pop cart)?

My site is http://www.kocamoca.com/en/12-skincare

 

Thank you in advance for help