flexible method
Make a Column Flexible. Example:
Column(
 children: [
 MaterialButton(child: Text('Button 1'), onPressed: () {}).flexible(),
 MaterialButton(child: Text('Button 2'), onPressed: () {}).flexible(),
 ],
 ),
Implementation
Flexible flexible({Key? key, int flex = 1, FlexFit fit = FlexFit.loose}) {
  return Flexible(
    key: key,
    flex: flex,
    fit: fit,
    child: this,
  );
}