Cart notes moved right when going back to cart and checkout button too small

Hello! Could someone please help me how to make sure that cart notes are left aligned? Once I go from cart to checkout and then back to cart again, the notes are moved to the right (see attached). There seems to be spaces added.

Also how can I make sure the checkout button is full width as seen on screenshot? now its not on the whole space provided.

Thanks for all help!!

Erik