Remove highlight when Flutter's TabBar is tapped

Question

I'm trying to implement my own TabBar design in flutter. I was able to get a pretty good result. However, when I tap another tab to change the tab, there is a highlight create by default as shown in the image here. I'm wondering if there is any way I can get rid of the square highlight on tapped. I've been looking around for like almost a day not and did not find any solution.

If anyone have any solution please let me know. Thanks.

Edited: as CopsOnRoad suggestion I wrapped the TabBar in the Container and set the color to Colors.transparent, but it does not really disappear so I tried to set the color to Theme.of(context).canvasColor for now.

    Container(
      color: Theme.of(context).canvasColor,
      child: TabBar(
        isScrollable: true,
        indicator: ShapeDecoration(
          color: Color(0xFFE6E6E6),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(99.0)
          )
        ),
        tabs: List<Widget>.generate(
          categories.length,
          (index) => Tab(
            child: Text(
              categories[index],
              style: TextStyle(
                fontFamily: 'Hiragino Sans',
                fontWeight: FontWeight.bold,
                fontSize: 18.0,
                color: Color(0xFF4D4D4D),
              ),
            ),
          )
        ),
      )
    )

Answer 1

That's the ripple effect. You can remove it by wrapping it in a Container and giving transparent color to it.