Mobile app
App Theme
Background image
You should try to match your typical target audience screen size, usually 1284 x 2778 (to match iPhone 14 Plus screen size) or 1170 x 2532 is good. The app will resize automatically the image for different other screen sizes
Font selection
Conf.app allows you to customize the font throughout your whole app, however this won’t be applied to external tools such as Google form. You need to select a similar font in Google form if they offer this possibility.