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You can customize the Okta-hosted sign-in page to fit your application's look and feel, but that's just one piece of a seamless user experience. If an error occurs during sign-in, Okta may need to display an error page to the user. You can customize the error page using an embedded HTML editor provided on the Custom Error Pages tab of the Customization page.
In what situations does Okta serve error pages to the user? The error page appears when a critical error occurs or an application is misconfigured. See Okta-hosted flows for more information on Okta-hosted functionality.
Before you can get started customizing error pages, you must have already customized your Okta URL domain. A custom error page appears only when an application connects to Okta using your custom domain. Otherwise, the default Okta error page appears.