add sizedBox extension

lib/ansu_ui.dart

@@ -21,5 +21,7 @@ export 'text_field/as_search_text_field.dart';
 
 export 'utils/screen_adapter.dart';
 
+export 'extension/sizedbox_extension.dart';
+
 //`BOTTOM` is external lib
 export 'package:flutter_screenutil/flutter_screenutil.dart';

lib/extension/sizedbox_extension.dart

@@ -0,0 +1,9 @@
+import 'package:ansu_ui/ansu_ui.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_screenutil/flutter_screenutil.dart';
+
+extension SizedBoxExt on num {
+  Widget get wb => SizedBox(width: ScreenUtil().setWidth(this));
+
+  Widget get hb => SizedBox(height: ScreenUtil().setWidth(this));
+}