Pick a color with the eyedropper
Every color picker in the app has an eyedropper - sample any color from anything on your screen for image borders, backgrounds, text and the rest.
Starts at 1:40 in the 1.3.4 release videoWatch on YouTube
More in Backgrounds, borders & gaps
See all 10Add a background image to a spread40:18Set background opacity40:31Apply a background to every spread40:41Change the project background color46:27Add borders around your photos46:46Set the gap between photos46:00Remove the gap at the book gutter43:07Fill an empty placeholder with a color or gradient0:47Hide the book gutter indicator45:43