Pink Black Keyboard Theme is a free Android application developed by Keyboard Arts Themes under the Personalization category. To activate the keyboard theme, you need to install the latest version of RainbowKey, a requirement that is mentioned in the app's description. Once installed, users can access and apply the theme directly from RainbowKey's interface.

Pink Black Keyboard Theme provides users with a stylish and elegant design, with a combination of pink and black colors that create a harmonious contrast. The theme is easy to use and does not require any additional settings. The app includes several features such as the ability to create your own keyboard with your favorite pictures, decorate your keyboard with 40+ beautiful fonts and colors, 10+ built-in themes to choose from, 30+ stylish fonts to decorate your words, swipe input for one-handed typing, smart emoji prediction with 1000+ lovely emojis, auto-correction, and word prediction, and a moving cursor that allows users to swipe on the space bar to move the cursor position.

Overall, Pink Black Keyboard Theme is a great option for users who want to add a touch of elegance to their device's keyboard. The app is easy to use and provides a wide range of customization options that users can enjoy.