Drop shadow on specific image block pages (NOT site-wise) for product info page

Site URL: https://www.beauxbois.com

I know absolutely nothing about coding but I am looking to add drop shadows on specific pages on my product pages ONLY. 

I think they add a really good effect and depth for my product. I created them on the PDF download spec-sheet.see sample below... I found a video on Youtube that gives the coding for image blocs for the entire site but not specific pages.

Any help greatly appreciated!

See below example of one of the pages I want to put a drop shadow to.ima

x https://www.beauxbois.com/torria