Waybar: Request: Style sway/window with empty workspace

[forkbomb9]

It would be nice to be able to change the background of the sway/window module when no windows are present:

#window {
    background: rgba(12, 12, 12, 0.4);
    color: #e5e5e5;
    padding-left: 10px;
    padding-right: 10px;
    border-radius: 15px;
}

#window.empty {
    background: rgba(12, 12, 12, 0.0);
}

Right now, it looks weird...

[Alexays]

You can do this with

window#waybar.empty #window {
    background: rgba(12, 12, 12, 0.0);
}