I'm trying to recreate this shape(s) in illustrator and am not sure how it was done. I came up with a similar effect using the blend tool and it works fine for the project I'm working on but am really curious to know how this was done.
- Create a round cornered rectangle (white in this case).
- Go to
Effect > Blur > Gaussian Blur...and apply some blur (you can also do this via
fxin the appearance palette).
- Reduce the opacity of the blurred rectangle (you can do this in the appearance panel or the transparency panel).
The exact parameters and values will require some experimentation.