remove elivation on android studio bottom navigation bar
<android.support.design.widget.BottomNavigationView
android:id="@+id/bottom_navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="@android:color/white"
app:elevation="0dp"
app:menu="@menu/bottom_navigation_main" />