option

xsession.windowManager.i3.config.bars.*.colors.focusedWorkspace

Border, background and text color for a workspace button when the workspace has focus.

Declarations
Type
null or (submodule)
Default
null for state version ≥ 20.09, as example otherwise
Example
{
  background = "#285577";
  border = "#4c7899";
  text = "#ffffff";
}