How do I customize closed captions on my iPhone or iPad?

To customize closed captions on an iPhone or iPad:

1. From the home page of the app, navigate to Settings via the menu in the upper left hand corner. 
2. On the main Settings page, select Caption Style. Certain default customizations are available on the Caption Style page and can be selected. 
3. Select Create New Style.  
4. From here, name your style as well as select your desired colors and text. 
5. Once finished, select Caption Style in the upper left hand corner to return to the Caption Style page. 
6. Select your custom style from the selections. 
7. Your customization is now enabled and will continue to display until changed using the steps above.