Dear R @runeok
I had some difficulty with the Feathered-edge because it seemed to rely upon the 'background image' property
But i came across the Webkit-mask and this worked when applied to my Carousel slide - unsure about its compatibility with "IE"
It would be worth looking into as an option forwards for you:
https://www.quora.com/How-do-you-feather-the-edges-of-an-image-using-CSS
I used a piece of code from the above link to make sure it would work :)
Best
Richard