React native bottom-tabs bottom navigation bar has ugly white line on top

Issue

So I am making a bottom navigation bar for a react native app, and the bottom navigation bar has a white line on top as so: I made an expo snack that reproduces this, I hope someone can find a solution :))

The expo snack

I tried tweaking the positioning and playing around with style props, but the white line is seemingly always there.

Solution

Set borderTopWidth to zero.

screenOptions={{
  tabBarStyle: {
    backgroundColor: '#272929',
...
    borderTopWidth: 0,
  },
}}

Answered By - user18309290