Starting April 10th, 2017, Google will slowly roll out a new login page, making the sign-in consistent across computers, phones and tablets. The rollout will start with a small set of users on April 10 and ramp up slowly over the course of several weeks. See Google’s blog regarding these changes here:
https://gsuiteupdates.googleblog.com/2017/04/update-refreshing-google-accounts-login.html