In this post, I’ll shows how to setup Azure AD company branding options. You can se your organization’s logo and custom color schemes to provide a consistent look-and-feel on your Azure Active Directory.
Add Company Branding
Prerequisites: The user account requires Azure Active Directory Premium 1 or Premium Licenses.
Step 1: Connect to Azure Active Directory admin center (https://aad.portal.azure.com)
Step 2: Navigate to Azure Active Directory -> Company branding and select to Configure icon to Configure / Edit Company branding

Step 3: Click Configure or Edit the branding configuration and provide the information as show in the screenshot below and Save.
Note: The language is automatically set as your default language based on the Azure subscription setup and it can’t be changed. However, you can configure additional languages by select the New Language option.

Step 4: The Company branding page is saved in Azure Active Directory

Step 5: After you’ve created the Custom branding, you can access the page by https://login.microsoftonline.com/<domain name>
