Although Ionic has its own out-of-the-box default themes, you might want to customize your app's look and feel even further. There are several methods, as follows:
- Changing the style sheet within the Sass file
- Detecting platform-specific types (iOS, Android, Windows) in JavaScript and applying custom classes or AngularJS conditions
Either of the preceding two methods should work, but it's highly recommended to apply customization in a Sass file before the app is built, in order to achieve maximum rendering performance.