Today more and more organizations are transitioning to Office 365 which is a cloud based solution offered by Microsoft. When an organization purchases the Office 365 subscription the login screen can be customized accordingly.
Below is the default login screen
In Order to customize the above screen with the Organizations logos and pictures do the following.
Log in to the Admin page of Office 365 and click on AzureAD
It will sign in to the Azure Management Portal and click on the relevant domain name to be customized
From the domain window select configure
Click on Customize branding
Brose and locate the necessary images and click on the arrow to move to the next screen and click ok.
Once the Azure has been updated the login screen will be changed accordingly.