opt.

lib/view/page/convert.dart

@@ -3,7 +3,7 @@ import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_gen/gen_l10n/l10n.dart';
-import 'package:toolbox/core/extension/context.dart';
+import 'package:toolbox/core/extension/context/snackbar.dart';
 import 'package:toolbox/data/res/ui.dart';
 import 'package:toolbox/view/widget/value_notifier.dart';
 
@@ -61,7 +61,7 @@ class _ConvertPageState extends State<ConvertPage>
         controller: ScrollController(),
         child: Column(
           children: [
-            height13,
+            UIs.height13,
             _buildInputTop(),
             _buildMiddleBtns(),
             _buildResult(),