add loading bar in init security page

lib/security.dart

@@ -1,3 +1,4 @@
+import 'dart:ui' show ImageFilter;
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:provider/provider.dart';
@@ -62,7 +63,8 @@ class _SecurityPageState extends State<SecurityPage> {
       body: AnnotatedRegion<SystemUiOverlayStyle>(
         value: style.copyWith(statusBarColor: color.background),
         child: SafeArea(
-          child: Container(
+          child: Stack(children: [
+              Container(
                 padding: const EdgeInsets.all(20.0),
                 height: MediaQuery.of(context).size.height,
                 decoration: BoxDecoration(
@@ -138,6 +140,9 @@ class _SecurityPageState extends State<SecurityPage> {
                     ]
                   )
                 )
+              ),
+              this._accountsLoaded ? Container() : LoaderTransparent(color: color.primary)
+            ]
           )
         )
       )
@@ -155,7 +160,6 @@ class _SecurityPageState extends State<SecurityPage> {
 
     // check if has logined.
     final loginedAccounts = await getLogined();
-
     if (loginedAccounts.length != 0) {
       print("INFO: START LOGINED USE CACHE");
       final mainAccount = loginedAccounts[0];
@@ -279,3 +283,31 @@ class _SecurityPageState extends State<SecurityPage> {
     ));
   }
 }
+
+class LoaderTransparent extends StatelessWidget {
+  final Color color;
+  LoaderTransparent({required this.color});
+
+  @override
+  Widget build(BuildContext context) {
+    final height = MediaQuery.of(context).size.height;
+    final width = MediaQuery.of(context).size.width;
+
+    return BackdropFilter(
+      filter: ImageFilter.blur(sigmaX: 6.0, sigmaY: 6.0),
+      child: Container(
+        height: height,
+        width: width,
+        child: Center(
+          child: SizedBox(
+            height: 60.0,
+            width: 60.0,
+            child: CircularProgressIndicator(
+              valueColor: AlwaysStoppedAnimation(this.color),
+              strokeWidth: 12.0
+            )
+          )
+        )
+    ));
+  }
+}