criado os widgets dropdown_button_default.dart, subtitle_containers.dart, alert_dialog_default.dart e title_containers.dart.

e ajustada a tela main_procedures_screen.dart

lib/widgets/dropdown_button_default.dart

@@ -0,0 +1,50 @@
+import 'package:flutter/material.dart';
+import 'package:rkm/widgets/text_default.dart';
+
+import '../utils/color_palette.dart';
+import '../utils/const_variable.dart';
+
+class DropDownButtonDefault extends StatelessWidget {
+  var onChanged;
+  String? select;
+  String title;
+  List<String> list;
+  double width;
+
+  DropDownButtonDefault({
+    required this.onChanged,
+    required this.select,
+    required this.title,
+    required this.list,
+    required this.width
+});
+
+  @override
+  Widget build(BuildContext context) {
+
+    return Column(
+      children: [
+        Container(
+          width: width,
+          margin: ConstVariable().marginHightInput,
+          color: ColorPalette.white,
+          child: DropdownButtonHideUnderline(
+            child: DropdownButton<String>(
+                hint: TextDefault(text: title,fontSize: ConstVariable().fontSizeInput,textAlign: TextAlign.end),
+                value: select,
+                items: list.map((value) => DropdownMenuItem(
+                  value: value,
+                  child: TextDefault(
+                    text: value,
+                    fontSize: 15,
+                  ),
+                )
+                ).toList(),
+                onChanged:onChanged
+            ),
+          ),
+        ),
+      ],
+    );
+  }
+}