I wanna change the background color of Pd. The default is white, but I wanna change it to black, and font color to white. (invert color for my eyes)

First attempt:

I've read this, but there is no *pd.tk*, neither *u_main.tk* in src.

Second attempt:

In pd-gui.tcl file, I change this white to black. But no luck.

option add *PatchWindow*Canvas.background "white" startupFile

Third:

but still no luck.

Any idea?

best,

akntk