Universal style for ionic app

Hi everyone! I would like my application to look the same in android, ios and browser. How can I use a universal css instead platform specific css?

I guess

iOS style

IonicModule.forRoot({
   mode: 'ios'
}

or Android style

IonicModule.forRoot({
   mode: 'md'
}

I would like to urge you not to do this. Users of a specific platform expect apps to look and feel consistently with all the other apps they use on that platform.