Trying to get a background loaded

[Flo.C (Flo)]

Its from @Martin_Granger s thread. I stumbled over it as I looked how HA could look like

Lovelace instant'ish CSS changes

thanks, I think one of the elements of a nice looking interface is a bg that matches the theme… and it’s really what makes this one, I can’t find a match on google any links/upload?