CSS Change for mobile device (buy credits cut off)

Hi
I need some help resolving this issue on the buy credits page. (currently on mobile devices / smaller screens its cut 1/2 way off the page) and needs to be centered in the screen of the smaller devices + reduced to fit the screen size

Please see Screenshot: http://monosnap.com/image/9dCcKqOl38mUaUDMdMBj57EhFYvgYi
Domain Link: http://tinyurl.com/o6gy9lk

you need to be logged in
try test user account
Aicee
asdf

Support access also open

Thanks
Tom