I'm creating a custom policy and I'm trying to customize the behavior when the policy is loading between different pages. Currently, the behavior is that the screen darkens and some text is displayed that overlaps with the rest of the UI. If possible, I'd like to display some completely different HTML content during loading. So far, I've been unable to affect the loading content in the same way that I've been able to affect the rest of the UI.
I have been able to see that a couple divs do appear during loading with IDs "simplemodal-overlap" and "simplemodal-container", and I've attempted to modify these divs using JQuery in the HTML file I've provided to Azure for the custom policy, but nothing I've done seems to have affected those divs in any way.
Has someone customized the loading UI for a custom policy before and can they give me advice on how I can affect its behavior?