Layout created for single screen app

lib/views/DropDownBox.dart

@@ -0,0 +1,37 @@
+import 'package:dropdown_search/dropdown_search.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+import '../Utils/Constants.dart';
+
+class DropDownBox extends StatelessWidget {
+  final List<String> _selection;
+  final Function(String?) _onChanged;
+
+  const DropDownBox(this._selection, this._onChanged, {super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Card(
+      color: colourThree,
+      elevation: 2,
+      shape: const RoundedRectangleBorder(
+          borderRadius: BorderRadius.all(Radius.circular(22))),
+      child: DropdownSearch<String>(
+        popupProps: const PopupProps.dialog(showSearchBox: true),
+        items: _selection,
+        dropdownDecoratorProps: const DropDownDecoratorProps(
+          dropdownSearchDecoration: InputDecoration(
+            contentPadding: EdgeInsets.all(14),
+            border: InputBorder.none,
+            filled: true,
+            fillColor: Colors.transparent,
+            hintText: "Select a currency",
+          ),
+        ),
+        onChanged: _onChanged,
+      ),
+    );
+  }
+
+}