Flutter Container Widget Width Not Working

Question

I am trying to give a fixed with to my container. I want it to be 50% of the screen. It seem not to be working. Here is my code.

Container(
    width: MediaQuery.of(context).size.width * 0.50,
    padding: EdgeInsets.symmetric(vertical: 15),           
    decoration: BoxDecoration(
       border: Border.all(color: Color.fromARGB(255, 210, 210, 210)),
       borderRadius: BorderRadius.all(Radius.circular(20)),
       color: Colors.grey[100],
    ),
   child Text('50 percent container'),
)

Answer 1

Change:

child Text('50 percent container'),

To:

child: Text('50 percent container'),