some css not working while running ionic 4 app on ios simulator

All css works fine when i run ionic app on android but ion-content background image does not display when i run the app in Xcode simulator(ios).

I have already tried to change the path of the image. Still then it is not working.

<ion-content class="home">

here is the css files

.home {
 --background: transparent; 
 background-image: url('assets/img/bg.png');

}

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Source Url some css not working while running ionic 4 app on ios simulator