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I can't figure out how to make the FAB smaller inside the first Container in the list. It seems to want to occupy the complete container, no matter what I try. Ive even tried a container within a container. The complete Orange area is clickable. I tried SizedBox, same result. Here is the code.

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final title = 'Horizontal List';
    return MaterialApp(
      title: title,
      home: Scaffold(
        appBar: AppBar(
          title: Text(title),
        body: Container(
          margin: EdgeInsets.symmetric(vertical: 20.0),
          padding: EdgeInsets.all(30),
          height: 200.0,
          child: ListView(
            scrollDirection: Axis.horizontal,
            children: <Widget>[
              Container(
                width: 160,
                color: Colors.yellowAccent,
                child: SizedBox(
                  height: 50,
                  width: 50,
                  child: FittedBox(
                    child: FloatingActionButton(
                      backgroundColor: Colors.deepOrange,
                      foregroundColor: Colors.indigo,
                      child: Icon(Icons.add, size: 20),
                      onPressed: () {},
              Container(
                width: 160.0,
                color: Colors.red,
              Container(
                width: 160.0,
                color: Colors.blue,
              Container(
                width: 160.0,
                color: Colors.green,
              Container(
                width: 160.0,
                color: Colors.yellow,
              Container(
                width: 160.0,
                color: Colors.orange,
      child: Container(
        margin: EdgeInsets.only(left:80.0, top:80.0, bottom: 10.0) ,
        child:  FloatingActionButton(
          backgroundColor: Colors.deepOrange,
          foregroundColor: Colors.indigo,
          child: Icon(Icons.add),
          onPressed: () {},
Use Row or Column. Please refer the code as below:
    child: SizedBox(
      height: 50,
      width: 50,
      child: Row(
        mainAxisAlignment: MainAxisAlignment.end,
        children: <Widget>[ FloatingActionButton(
          backgroundColor: Colors.deepOrange,
          foregroundColor: Colors.indigo,
          child: Icon(Icons.add),
          onPressed: () {},
        
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