Hi Dan-
I checked out the website you sent over, and I did see the reviews working correctly on your Testimonials page. It looks like you’re using the WP Customer Reviews plugin, which is the one I have used in the past and recommend. Can you clarify what you mean by “the page didn’t recognize the short code?”
Generally speaking, your contact forms will have the background color of whichever block you’ve pasted the shortcode into. Take this example, where the same form is embedded into to different blocks: