Pull Post Info Based On Link

Hello!
I have testimonials that are added to the site as a post with a ID number. When clicking on a “Read more…” link – to see the full testimonial, the system brings up a post page – that does not have all the “bells and whistles” that I have added/styled on the rest of the sites’ pages. I’m curious to know if I can dynamically use a single page that I have styled and via shortcode, display the featured image and post for the testimonial that the viewer has selected to get more info by clicking “Read more…”? Or do I need to create a separate page for each testimonial and hardcode the link from the read me to the specific page – then using shortcode to just bring in that posts info?

https://ww.wp.xz.cn/plugins/posts-in-page/