Waybar: Improve empty workspace colors

.config/waybar/style.css

@@ -85,12 +85,18 @@ label:focus {
     background-color: @bgcolor;
 }
 
-#workspaces button.active {
+#workspaces button.active,
+#workspaces button.active.empty {
     background-color: @bgcolor;
     box-shadow: inset 0 -3px @blue;
     color: @fgcolor;
 }
 
+#workspaces button.empty {
+    background-color: transparent;
+    color: @bgcolor;
+}
+
 #workspaces button.focused {
     background-color: @bgcolor;
 }