Sticky Buy Button?

Please post a link to your page.

My site is www.uniquelydolledwigs.com @rwp

So you want a floating add to cart button?

Yes, I want it to appear at the bottom or top of the product page just like the picture or similiar, if possible.

This is an interesting one.......

Do you know a plugin I can use or have an idea on how to do it? 

I've been messing with it for 2 hours now.  Maybe getting somewhere?

I'm not sure yet lol.

Going to throw in the towel on this one, sorry.

Lol thank you for trying! A Squarespace user has it (the first picture I posted for reference), so I thought it would be easy to find a plugin. 

Can you post a link to that page?

Yes, its: https://jalley.art/collections/jeremiah-jalley-abstract-art-photography-collection/products/16nyct067-jeremiah-jalley-art-work-abstract-turned-blue-photograph 

Looks like that's shopify.

Really? The owner commented on the forum asking a question about the website

I think shopify has a squarespace plug in.