Change window colors

[gibranlp]

Is your feature request related to a problem? Please describe.
Change the colors of the window dinamycally depending onthe wallpaper

Describe the solution you'd like
i am crating system based all on Pywal, so far i managed to change de background lightdm according to my current wallpaper, i would like to change the color of the login window also dynamically accordng

Describe alternatives you've considered
if you could point me to the file qhere the colors are stored maybe i can create a file for the wal templatsto change the colors evey time i change the wallpaper

Additional context
Thanks for this Greeter is awesome.