Widget background doesn't match wallpaper

(Sorry if this is a duplicate post. I tried to post a few minutes ago but don't think it saved.)

The widget background doesn’t match the downloaded wallpaper perfectly. See screenshot (ignore the dock apps that I haven’t moved yet).

I followed the instructions though they seem slightly different for iOS 18 so I may have missed something.

Also: please put the instructions online so we can read them on laptop while setting up the phone. Would be a great help.