ngrok tunnel is not keeping theme / style of wordpress site hosted in IIS

I have created a wordpress site and am hosting it in IIS. I want to demo this site without deploying it, and I have installed ngrok for this purpose.

When I view the site on my local host, everything looks fine. However, when I view the site remotely through the ngrok tunnel, the content appears, but all style & theme elements are lost.

I apologize, I am new at this and I don't know what code / configuration / documentation would be helpful for solving this problem.

Any idea why this may be occurring? Thanks a million for any help or suggestions.

Ben