can't pay if offline

lib/screens/wallet_view.dart

@@ -360,7 +360,10 @@ class WalletViewScreen extends StatelessWidget {
             //   },
             // ),
             const Spacer(),
-            Container(
+            Consumer<SubstrateSdk>(builder: (context, _sub, _) {
+              return Opacity(
+                opacity: _sub.nodeConnected ? 1 : 0.5,
+                child: Container(
                   height: buttonSize,
                   decoration: BoxDecoration(
                     color: const Color(0xff7c94b6),
@@ -381,19 +384,27 @@ class WalletViewScreen extends StatelessWidget {
                               child: Image(
                                 image: AssetImage('assets/vector_white.png'),
                               )),
-                      onTap: () {
+                          onTap: _sub.nodeConnected
+                              ? () {
                                   paymentPopup(context, _walletViewProvider);
-                      }),
+                                }
+                              : null),
                     ),
                   ),
                 ),
+              );
+            }),
             const SizedBox(height: 9),
-            Text(
+            Consumer<SubstrateSdk>(builder: (context, _sub, _) {
+              return Text(
                 "Faire un\nvirement",
                 textAlign: TextAlign.center,
                 style: TextStyle(
-                  fontSize: buttonFontSize, fontWeight: FontWeight.w500),
-            ),
+                    color: _sub.nodeConnected ? Colors.black : Colors.grey[500],
+                    fontSize: buttonFontSize,
+                    fontWeight: FontWeight.w500),
+              );
+            }),
             SizedBox(height: isTall ? 50 : 20)
           ]),
         ));