fluxbox: overriding style background color

[Haines Brown <haines@histomat.net>]

I'm running Twice window style under fluxbox. I want to change its
default background color from gray to black. I can make the background
black with the command fbsetroot -solid black, but it does not
persist. When fluxbox is restarted, it reverts to grey.

I tried putting
  fbsetroot |-foreground rgb:db/dc/83 -solid rgb:db/bc/83|style|:0.0
into the last wallpaper file, but when fluxbox is rstarted it reverts
to the old gray color. I tried to put fbsetroot -solid black into
fluxbox starup file, but it has no effect.

How do I override the Twice style background with black color? 

Haines Brown