Cannot add column inside a card below a row Flutter - flutter

Question

I am implementing a card where I have rows, I want to add column below rows inside the card in flutter. I am unable to add column at the bottom inside the card.
Column buildWorkshopSection() {
return Column(
children: [
Card(
margin: EdgeInsets.symmetric(horizontal: 20.0, vertical: 5.0),
clipBehavior: Clip.antiAlias,
color: Colors.white,
elevation: 5.0,
child: Padding(
padding:
const EdgeInsets.symmetric(horizontal: 8.0, vertical: 22.0),
child: Row(
children: <Widget>[
Expanded(
child: Column(
children: <Widget>[
SizedBox(
height: 5.0,
),
buildStartTimeWorkshop(),
],
),
),
Expanded(
child: Column(
children: <Widget>[
SizedBox(
height: 5.0,
),
buildCloseTimeWorkshop(),
],
),
),
],
),
),
)
],
);
}

Answer 1

Add submit button like this
Card(
margin:
EdgeInsets.symmetric(horizontal: 20.0, vertical: 5.0),
clipBehavior: Clip.antiAlias,
color: Colors.white,
elevation: 5.0,
child: Padding(
padding: const EdgeInsets.symmetric(
horizontal: 8.0, vertical: 22.0),
child: Column(
children: [
Row(
children: <Widget>[
Expanded(
child: Column(
children: <Widget>[
SizedBox(
height: 5.0,
),
buildStartTimeWorkshop(),
],
),
),
Expanded(
child: Column(
children: <Widget>[
SizedBox(
height: 5.0,
),
buildCloseTimeWorkshop(),
],
),
),
],
),
SizedBox(
height: 20,
),
RaisedButton(
onPressed: () {},
child: Text("Submit"),
)
],
),
),
),
It look like this