提交：修改缺省图字号大小；

lib/widget/state_layout.dart

@@ -76,7 +76,7 @@ class _StateLayoutState extends State<StateLayout> {
           hintText,
           style: const TextStyle(
             color: Color(0xff86909C),
-            fontSize: 7.0,
+            fontSize: 14.0,
             fontWeight: FontWeight.normal,
           ),
         ),