Hi Mohamed,
we've been struggling for a long time with the same issue as walttools wrote in his first post, but your solution only works if there are no other views in the first step of the checkout and doesn't work for guest checkout, because guest users are still redirected to the first step of the checkout in which case they can never continue because the "Next" button is hidden by your CSS code.
Do you have a more general solution so there won't be two confusing Register/Next buttons, which works for every situation?
Thanks.
EDIT: sorry, we wrote our initial post too quickly without checking, so we changed our text