Why doesn't my widget match my wallpaper?
If your Blank widgets aren't the same color as your wallpaper, import your wallpaper as a Custom Wallpaper inside Blank Spaces. That makes the widget background match exactly, regardless of which wallpaper you're using.
If your widgets don’t blend into your wallpaper, the widget background and the wallpaper aren’t the same image. The universal fix is to import your wallpaper as a Custom Wallpaper inside Blank Spaces. Once imported, the widget background uses the exact pixels of your wallpaper, so the two match regardless of which wallpaper you’re using (an iOS default, a photo, or anything custom).
How to fix it
Set the wallpaper you want in iOS. Settings > Wallpaper.
Take a clean screenshot of just the wallpaper. Long-press your home screen until the apps jiggle, swipe past all your pages to a blank one, then screenshot.
In the Blank Spaces app, tap the paintbrush icon in the top right, tap Custom Wallpaper, then tap Import Screenshot and select the screenshot you just took.
For the full walkthrough with screenshots: How to set a custom wallpaper →
On iOS 26?
iOS 26 adds a translucent glass border around widgets. The border is a separate iOS-level effect from the color match. The only way to remove it currently is to use one of Blank’s built-in default wallpapers, which are paired with matching widget colors. The border cannot currently be removed when using a custom imported wallpaper.