hover affect please help

[jb9998]

Hi,

I'm trying to recreate sites to learn and would love to know how/the code to implement this on my test site: 

goal: hover green gradient on pdps 

https://confidenceman.polydor.co.uk/collections/music

test site:

https://f3419d-e6.myshopify.com

Password: skagog

[jb9998]

the products 

 

[jb9998]

where would i add this code to my test site to get same effect? thanks 

[jb9998]

sadly didnt work!

[jb9998]

i wanted it on all products 🙂