I’d like to give you an early heads up on some visual design updates that are coming to the Azure AD sign-in experience. Microsoft inform about changes in sign-in experience related to online sign-in (Azure Ad sign-in). This is also used for sign-in to an Dynamics 365 environment.

Here is an overview about the changes in this release:

• Updated layout and styling of UI elements: The images below show the differences between the existing UI and the updated one. Expect the updated styling to show up on all authentication flows including MFA and change password screens.
• Moving all screens to the new sign-in experience: Some of our screens remained as-is when we enabled the new sign-in experience last year. As part of this update, we’re moving all screens to the new UI
• Change notification banner

You find the original blog article with a lot of screenshots here: https://cloudblogs.microsoft.com/enterprisemobility/2018/04/04/upcoming-improvements-to-the-azure-ad-sign-in-experience/