fix: Bootstrap column design

lib/pages/bootstrap_dialog.dart

@@ -1,5 +1,5 @@
 import 'package:adaptive_dialog/adaptive_dialog.dart';
-import 'package:fluffychat/widgets/layouts/one_page_card.dart';
+import 'package:fluffychat/config/themes.dart';
 import 'package:matrix/encryption.dart';
 import 'package:matrix/encryption/utils/bootstrap.dart';
 import 'package:matrix/matrix.dart';
@@ -92,16 +92,20 @@ class _BootstrapDialogState extends State<BootstrapDialog> {
         _recoveryKeyStored == false) {
       final key = bootstrap.newSsssKey.recoveryKey;
       titleText = L10n.of(context).securityKey;
-      return OnePageCard(
+      return AlertDialog(
-        child: Scaffold(
+        title: AppBar(
-          appBar: AppBar(
+          centerTitle: true,
           leading: IconButton(
             icon: Icon(Icons.close),
             onPressed: Navigator.of(context).pop,
           ),
           title: Text(L10n.of(context).securityKey),
         ),
-          body: ListView(
+        content: Center(
+          child: ConstrainedBox(
+            constraints:
+                BoxConstraints(maxWidth: FluffyThemes.columnWidth * 1.5),
+            child: ListView(
               padding: const EdgeInsets.all(16.0),
               children: [
                 TextField(
@@ -129,6 +133,7 @@ class _BootstrapDialogState extends State<BootstrapDialog> {
               ],
             ),
           ),
+        ),
       );
     } else {
       switch (bootstrap.state) {
@@ -161,16 +166,20 @@ class _BootstrapDialogState extends State<BootstrapDialog> {
           break;
         case BootstrapState.openExistingSsss:
           _recoveryKeyStored = true;
-          return OnePageCard(
+          return Scaffold(
-            child: Scaffold(
             appBar: AppBar(
+              centerTitle: true,
               leading: IconButton(
                 icon: Icon(Icons.close),
                 onPressed: Navigator.of(context).pop,
               ),
               title: Text(L10n.of(context).pleaseEnterSecurityKey),
             ),
-              body: ListView(
+            body: Center(
+              child: ConstrainedBox(
+                constraints:
+                    BoxConstraints(maxWidth: FluffyThemes.columnWidth * 1.5),
+                child: ListView(
                   padding: const EdgeInsets.all(16.0),
                   children: [
                     TextField(
@@ -267,6 +276,7 @@ class _BootstrapDialogState extends State<BootstrapDialog> {
                   ],
                 ),
               ),
+            ),
           );
         case BootstrapState.askWipeCrossSigning:
           WidgetsBinding.instance.addPostFrameCallback(