Hi @Mak
Just to get you right.
You are talking about gradients or transitions?
What about putting a gradient image as hover-image for the project thumbnails?
Otherwise you can also try do add a CSS gradient.
You can add a CSS gradient to any div-box you like in the Custom CSS section.
Have a look at CSS gradients here:
https://www.w3schools.com/css/css3_gradients.asp
let me know if you have more specific questions – or post a link to your website.
Best!
Marius