Ionic automatically created platform-specific parent classes and put them at the <body> tag. The iOS app will include the .ios class. The Android app will have the .md class. So, for style sheet customization, you can leverage those existing classes to change the look and feel of your app.
Ionic documentation has a list of all platform modes and configuration properties at http://ionicframework.com/docs/v2/theming/platform-specific-styles/.
Platform |
Mode |
Details |
iPhone/iPad/iPad |
ios |
The iOS style is used across all Apple products |
Android |
md |
md means Material Design as this is the default design for Android devices |
Windows Phone |
wp |
Viewing on any Windows device inside Cordova or Electron uses ... |