nixos/modules/home/sway/waybar.css

* {
  border: none;
  border-radius: 0;
  padding: 0;
  margin: 0;
  font-size: 11px;
  font-family: "FiraCode Nerd Font";
}

window#waybar {
  background: #292828;
  color: #ffffff;
}

#workspaces button {
  margin-right: 2px;
  padding-left: 2px;
  padding-right: 2px;
  color: #ffffff;
}
#workspaces button:hover, #workspaces button:active {
  background-color: #292828;
  color: #ffffff;
}
#workspaces button.focused {
  background-color: #383737;
  color: #00ffee;
}

#mpd {
  padding-left: 3px;
  padding-right: 3px;
}

#tray
#custom-squeekboard
#language
#network
#backlight
#clock
#battery {
  border-width: 1px;
  border-style: none none none solid;
  border-color: #444444;
  padding-left: 3px;
  padding-right: 3px;
}

#battery.warning {
  background-color: #ffd760
}

#battery.critical {
  background-color: #ff4040
}