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

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.

Start by reproducing the issue with a parent Activity containing a profile Fragment and inspect how Space Navigation View handles the space above the navigation border. Compare the Activity background with the Fragment appearance; done means the Fragment shows the navigation border without inheriting the Activity's background color.

Written by the indexing model from the issue text.