How to set backgroundcolor of text in flutter

new Container(
  width: 100,
  height: 30,
  decoration: new BoxDecoration(
    color: Colors.green
  ),
 )

 Container(

                          decoration: const BoxDecoration(
                            color: Colors.white,
                 borderRadius: BorderRadius.all(Radius.circular(15)),
                              ),
                        child: Text(
                          widget.data.length > 20?widget.data.substring(0, 20)+ "..":widget.data,
                          style: TextStyle(
                              fontSize: displayWidth(context) * 0.070,                            
                              color: Colors.black,                            
                              fontWeight: FontWeight.bold),
                        ),
                      ),