Posicionar botão no fim da página

lib/screens/CartScreen.dart

@@ -2,7 +2,6 @@ import 'package:apus_drones_mobile/constants/UserType.dart';
 import 'package:apus_drones_mobile/screens/Appbar.dart';
 import 'package:apus_drones_mobile/widgets/BotNavBar.dart';
 import 'package:apus_drones_mobile/widgets/Fee.dart';
-import 'package:apus_drones_mobile/widgets/Header.dart';
 import 'package:flutter/material.dart';
 
 class CartScreen extends StatefulWidget {
@@ -20,15 +19,16 @@ class _CartPageState extends State<CartScreen> {
       appBar: Appbar(title: 'Carrinho'),
       resizeToAvoidBottomInset: false,
       backgroundColor: Colors.grey.shade100,
-      body: Container(
-        padding: EdgeInsets.only(top: 15),
+      body: SafeArea(
+        // padding: EdgeInsets.only(top: 15),
         child: Column(
           children: [
             Expanded(
               child: ListView(
-                children: <Widget>[createCartList(), footer(context)],
+                children: <Widget>[createCartList()],
               ),
-            )
+            ),
+            footer(context)
           ],
         ),
       ),
@@ -40,7 +40,7 @@ class _CartPageState extends State<CartScreen> {
 
   footer(BuildContext context) {
     return Container(
-      height: 475,
+      padding: EdgeInsets.symmetric(vertical: 30),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.center,
         mainAxisAlignment: MainAxisAlignment.end,