Can't style unfocused panes with Zellij

[lukebarton]

1. Graphical issue inside a terminal pane (eg. something does not look as it should)

Unfocussed pane borders are always white with no control.

Basic information
zellij --version: zellij 0.40.1
stty size: n/a

Further information

themes {
  custom {
          fg "#000000"
          bg "#000000"
          black "#000000"
          red "#000000"
          green "#000000"
          yellow "#000000"
          blue "#000000"
          magenta "#000000"
          cyan "#000000"
          white "#000000"
          orange "#000000"
  }
}

Issue description

I tried this in 3 terminals. In alacritty terminal, I noticed that the white color was controlled by the terminal theme.

Minimal reproduction

Set all the theme colors to black. Observe white border.

Other relevant information

Really annoying, because the only thing I wanted to change was make the unfocussed pane less prominent 🙃