How to make fixed button flutter? - flutter

Question

I have a problem with fixed button inside scroll view , I made a column with SingleChildScrollView and two button, but the problem is that the screen do not scroll. I tried the bottom Navigation bar but it has the same problem. How I can fix this?
my code :
Column(
children: [
Expanded(
child: SingleChildScrollView(
scrollDirection: Axis.vertical,
child: Column(
children: [
ListView.builder(
shrinkWrap: true,
itemCount: 200,
itemBuilder: (context, index) {
return Text("200");
},
),
ListView.builder(
shrinkWrap: true,
itemCount: 20,
itemBuilder: (context, index) {
return Text("bargougui");
},
),
],
),
),
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Padding(
padding: const EdgeInsets.all(8.0),
child: ClipRRect(
borderRadius: BorderRadius.circular(20.0),
child: Container(
width: 150,
height: 50,
child: ElevatedButton(
style: ElevatedButton.styleFrom(
primary: Colors.grey[300],
),
onPressed: () {},
child: Text(
'Contacter',
style: TextStyle(
fontSize: 20,
fontWeight: FontWeight.w500,
color: Colors.black,
fontStyle: FontStyle.italic,
),
),
),
),
),
),
Padding(
padding: const EdgeInsets.all(8.0),
child: ClipRRect(
borderRadius: BorderRadius.circular(20.0),
child: Container(
width: 150,
height: 50,
child: ElevatedButton(
style: ElevatedButton.styleFrom(
primary: Colors.yellow,
),
onPressed: () {},
child: Text(
'Acheter',
style: TextStyle(
fontSize: 20,
fontWeight: FontWeight.w500,
color: Colors.black,
fontStyle: FontStyle.italic,
),
),
),
),
),
),
],
),
],
),
screen I want to make like this
any help will be appreciated ^^

Answer 1

Use Stack widget,
Stack(
children:[
SingleChildScrollView(),
Positioned(
bottom:0,
left:15,
right:15,
child:Row(children :[Button1(),Button2()],
,)
]
Try tweaking the numbers to fit your case.