Can't get space navigation border without activity's background color in a fragment.

[tirumala007]

i have an activity. and a profile fragment in that activity.
when i go into that fragment, the background color of the parent activity is visible with space navigation.
you can see in the image that white color in above space navigation border is from my activity. and i don't want to see in my fragment. i just want the border of the space navigation. help me.

[kjbaker-uk]

I also have the same issue. I cant get whatever is within the fragment to go behind the navigation bar.