Users who must use keyboard navigation (not mouse or touch) need to rely on visual cues to know when they’ve moved from one input option to another. Currently the color change that occurs when you keyboard navigate to the “Continue” button is so subtle that people regularly miss it in user testing. This causes people to accidentally enter “Back” when can delete their entries and cause frustration. Please increase the font size, add a border, or give some other clear visual cue to let the user know when they’ve landed on “Continue”. Remember also that many people are color-blind.