fix link

Author: mmacy

articles/active-directory-b2c/customize-ui-overview.md

@@ -161,7 +161,7 @@ Start by configuring company branding in Azure Active Directory within your Azur
 1. Sign in to the [Azure portal](https://portal.azure.com).
 1. Select the **Directory + subscription** filter in the top menu, and then select the directory that contains your Azure AD B2C tenant.
 1. In the left menu, select **Azure Active Directory**. Or, select **All services** and search for and select **Azure Active Directory**.
-1. Follow the steps in [Add branding to your organization's Azure Active Directory sign-in page](../active-directory/fundamentals/customize-branding).
+1. Follow the steps in [Add branding to your organization's Azure Active Directory sign-in page](../active-directory/fundamentals/customize-branding.md).
 
 In your user flow pages, the background color is shown before the background image is loaded. We recommended that you choose a background color that closely matches the colors in your background image for a smoother loading experience.