Title pretty much says it all. I want a background image to have a linear gradient fade to transparent. I've faded the image out to a color by overlaying a gradient on top of it, which unfortunately would only help me if my site background is a solid color. (see codepend example)

I tried to use an image in place of a color value :p No such luck. Anyone have any ideas?

https://codepen.io/anon/pen/wzArAN