Flutter - Container onPressed?

Don't use GestureDetector, it doesn't show ripple effect. Use InkWell instead.

InkWell(
  onTap: () {}, // Handle your callback
  child: Ink(height: 100, width: 100, color: Colors.blue),
)

Output:

I guess you can use GestureDetector widget like this:

new GestureDetector(
        onTap: (){
          print("Container clicked");
        },
        child: new Container(
          width: 500.0,
          padding: new EdgeInsets.fromLTRB(20.0, 40.0, 20.0, 40.0),
          color: Colors.green,
          child: new Column(
              children: [
                new Text("Ableitungen"),
              ]
          ),
        )
    );