dividerColor property
final
The color of the divider.
If the dividerColor is Colors.transparent, then the divider will not be drawn.
If null and ThemeData.useMaterial3 is false, TabBarThemeData.dividerColor color is used. If that is null and ThemeData.useMaterial3 is true, ColorScheme.outlineVariant will be used, otherwise divider will not be drawn.
Implementation
final Color? dividerColor;