Fade out should be white instead of gray

Currently, you can see the hard edge of the fade out because it's a light shade of gray rather than white.   
Before:   
![Screen_Shot_2016-12-07_at_12.36.10_PM](/uploads/c8fd2c6ba1742d1260614fd4c9cb29c9/Screen_Shot_2016-12-07_at_12.36.10_PM.png)
After:   
![Screen_Shot_2016-12-07_at_12.35.53_PM](/uploads/52b51e4a825658a0c440e0f1fb86a31c/Screen_Shot_2016-12-07_at_12.35.53_PM.png)
cc @nmrony

See merge request !7979