How to decorate Table's header in flutter

Question

Am trying to add some circular radius to the header of a table ,,

when i use clipRRect the Strings which are in the header are hidden by the blue color

the image in light blue is what i've tried , and the one in darker blue is the desired one.

here's my code snippet:

Widget build(BuildContext context) {

    return Scaffold(
      body: SafeArea(
        child: Center(

                child: ClipRRect(
                  borderRadius: BorderRadius.circular(12),
                  child: Container(
                    child: Table(
                      border: TableBorder(top: BorderSide(color: Colors.blue, width: 50)),

                      columnWidths: {
                        0:FractionColumnWidth(0.5),
                        1:FractionColumnWidth(0.25),
                        2:FractionColumnWidth(0.25),
                      },
                      children: [
                        buildRow(['Name','Total Hours','Defult Hours'],),
                        buildFirstRow(['Motasim Osman Ali Himat','4','3']),
                        buildFirstRow(['Rami Yassin Mahmoud','2','3']),
                        buildFirstRow(['Ahmed Omer Almobark','4','3']),
                        buildFirstRow(['Ahmed Omer Almobark','4','3']),


                      ],
                    ),
                  ),
                ),
              ),
            ),
          );


  }

  TableRow buildRow(List<String> cells) {
    return TableRow(
      children:
cells.map((cell) {
  return Padding(padding: EdgeInsets.only(top: 12,bottom: 35),
  child: Center(
      child:Text(cell,style: TextStyle(fontWeight: FontWeight.bold,
          fontSize: 11,color: Colors.white))),
  );}).toList()
    );
  }

  TableRow buildFirstRow(List<String> cells) {
    return TableRow(
        children:
        cells.map((cell) {
          return Padding(padding: EdgeInsets.only(bottom: 10),
            child: Center(
                child:Text(cell,style: TextStyle(//fontWeight: FontWeight.bold,
                    fontSize: 10))),
          );}).toList()
    );
  }}