android:layout_marginEnd="@dimen/fab_margin"
android:layout_marginBottom="@dimen/fab_margin"
android:padding="@dimen/fab_margin"
- android:tint="@android:color/white"
+ android:tint="?android:attr/colorBackground"
android:visibility="visible"
app:backgroundTint="?colorAccent"
app:layout_constraintBottom_toBottomOf="parent"