
Add and edit backgrounds in iMovie on iPhone
You can add a color background to your movie. iMovie includes a number of solid, gradient, and pattern backgrounds that you can customize.
Add a background
- With your project open, scroll the timeline so that the playhead (the white vertical line) appears where you want to add a background. 
- Tap the Add Media button  , then tap Backgrounds. , then tap Backgrounds. 
- Tap a solid color, gradient, or pattern, then tap the Add to Project button  . .
Change the color of a solid background
- With your project open in the timeline, tap the background clip you want to customize. 
- In the top-right corner of the viewer, tap the Color button  , then choose a color from the available options. , then choose a color from the available options. 
Change the colors of a gradient or pattern background
- With your project open in the timeline, tap the background clip you want to customize. 
- In the top-right corner of the viewer, tap the Color button  . . - Two Color buttons appear in the viewer, showing the primary and secondary colors used to generate the gradient or pattern.  
- Do any of the following: - Set the primary background color: Tap the first Color button  (on the left), then choose a color from the available options. (on the left), then choose a color from the available options.
- Set the secondary background color: Tap the second Color button  (on the right), then choose a color from the available options. (on the right), then choose a color from the available options.