floating next button

lib/learn.dart

@@ -148,6 +148,12 @@ class _QuizPageState extends State<QuizPage> {
           ],
         ),
       ),
+      floatingActionButton: askState != -1
+          ? FloatingActionButton.extended(
+              onPressed: _nextQuestion,
+              icon: const Icon(Icons.chevron_right),
+              label: const Text("Next"))
+          : null,
     );
   }
 }