Ionic cordova build android --release css not working

When i run ionic in emulator background color black is working
But after i run ionic cordova build android --release my app background back to white.

Can anyone help my problem?
This screenshot on my emulator (when run ionic cordova emulate android --livereload)

And this is when i build release the app

This is my ionic info

Ionic:

   Ionic CLI                     : 6.20.1 (C:\Users\fahri\AppData\Roaming\npm\node_modules\@ionic\cli)
   Ionic Framework               : @ionic/angular 6.2.1
   @angular-devkit/build-angular : 14.1.1
   @angular-devkit/schematics    : 14.1.1
   @angular/cli                  : 14.1.1
   @ionic/angular-toolkit        : 6.1.0

Cordova:

   Cordova CLI       : 11.0.0
   Cordova Platforms : android 9.1.0
   Cordova Plugins   : cordova-plugin-ionic-keyboard 2.2.0, cordova-plugin-ionic-webview 5.0.0, (and 3 other plugins)

Utility:

   cordova-res : 0.15.4
   native-run  : 1.6.0

System:

   Android SDK Tools : 26.1.1 (D:\apps\Sdk)
   NodeJS            : v16.16.0 (C:\Program Files\nodejs\node.exe)
   npm               : 8.11.0
   OS                : Windows 10