Fix the layout when there are no items.

lib/main.dart

@@ -118,11 +118,9 @@ class _HomePageState extends State<HomePage> {
             });
           },
         ),
-        body: Center(
+        body: Container(
-          child: Container(
+          color: Theme.of(context).colorScheme.primaryContainer,
-            color: Theme.of(context).colorScheme.primaryContainer,
+          child: Center(child: page),
-            child: page,
-          ),
         ),
         floatingActionButton: floatingButton,
       );

lib/pages/expense.dart

@@ -12,29 +12,31 @@ class ExpensePage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return ListView.builder(
+    return expenses.isEmpty
-      itemCount: expenses.length,
+        ? Text("Add expenses to get started!")
-      itemBuilder: (_, index) {
+        : ListView.builder(
-        final Expense curr = expenses[index];
+            itemCount: expenses.length,
-        return Center(
+            itemBuilder: (_, index) {
-          child: Padding(
+              final Expense curr = expenses[index];
-            padding: const EdgeInsets.all(4.0),
+              return Center(
-            child: Container(
+                child: Padding(
-              decoration: BoxDecoration(
+                  padding: const EdgeInsets.all(4.0),
-                borderRadius: BorderRadius.circular(4),
+                  child: Container(
-                color: Colors.greenAccent,
+                    decoration: BoxDecoration(
-              ),
+                      borderRadius: BorderRadius.circular(4),
-              child: Column(
+                      color: Colors.greenAccent,
-                children: [
+                    ),
-                  Text(curr.name),
+                    child: Column(
-                  Text("${curr.cost.toString()} ${curr.frequency.title}"),
+                      children: [
-                ],
+                        Text(curr.name),
-              ),
+                        Text("${curr.cost.toString()} ${curr.frequency.title}"),
-            ),
+                      ],
-          ),
+                    ),
-        );
+                  ),
-      },
+                ),
-    );
+              );
+            },
+          );
   }
 }