improve paddings

lib/screens/activity.dart

@@ -57,7 +57,7 @@ class ActivityScreen extends StatelessWidget with ChangeNotifier {
     final duniterIndexer = Provider.of<DuniterIndexer>(context, listen: false);
 
     if (indexerEndpoint == '') {
-      Column(children: <Widget>[
+      return Column(children: <Widget>[
         const SizedBox(height: 50),
         Text(
           "noNetworkNoHistory".tr(),

lib/screens/certifications.dart

@@ -27,6 +27,8 @@ class CertificationsScreen extends StatelessWidget {
             )),
         body: SafeArea(
           child: Accordion(
+              paddingListTop: 10,
+              paddingListBottom: 10,
               maxOpenSections: 1,
               headerBackgroundColorOpened: orangeC,
               scaleWhenAnimating: true,

lib/screens/wallet_view.dart

@@ -108,7 +108,7 @@ class WalletViewScreen extends StatelessWidget {
         body: SafeArea(
           child: Column(children: <Widget>[
             HeaderProfile(address: address, username: username),
-            SizedBox(height: isTall ? 10 : 0),
+            SizedBox(height: isTall ? 30 : 15),
             Row(mainAxisAlignment: MainAxisAlignment.spaceAround, children: [
               Column(children: <Widget>[
                 SizedBox(

lib/widgets/header_profile.dart

@@ -123,14 +123,14 @@ class HeaderProfile extends StatelessWidget {
                 //       ),
                 //     ),
                 //   ),
-                const SizedBox(height: 55),
+                // const SizedBox(height: 55),
               ]),
           const Spacer(),
           Column(children: <Widget>[
             ClipOval(
               child: defaultAvatar(avatarSize),
             ),
-            const SizedBox(height: 25),
+            // const SizedBox(height: 25),
           ]),
         ]),
       ),