
Add and edit backgrounds in iMovie on iPhone
You can add a color background to your video. iMovie includes a number of solid, gradient and pattern backgrounds that you can customise.
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 Background. , then tap Background. 
- Tap a solid colour, gradient or pattern, then tap the Add to Project button  . .
Change the colour of a solid background
- With your project open in the timeline, tap the background clip you want to customise. 
- In the top-right corner of the viewer, tap the Colour button  , then choose a colour from the available options. , then choose a colour from the available options. 
Change the colours of a gradient or pattern background
- With your project open in the timeline, tap the background clip you want to customise. 
- In the top-right corner of the viewer, tap the Colour button  . . - Two Colour buttons appear in the viewer, showing the primary and secondary colours used to generate the gradient or pattern.  
- Do any of the following: - Set the primary background colour: Tap the first Colour button  (on the left), then choose a colour from the available options. (on the left), then choose a colour from the available options.
- Set the secondary background colour: Tap the second Colour button  (on the right), then choose a colour from the available options. (on the right), then choose a colour from the available options.