Change your theme in Yahoo Mail for iOS
Choose from a number of themes to change the background colors of the app. You can even pick a different theme for every account you've added!
- Tap the Menu icon.
- Tap Settings.
- Tap Themes.
- Tap the account you want to apply a theme to.
- This only appears if you have multiple accounts.
- At the bottom, tap any theme to preview it.
- Tap Back to apply the theme.