added system tray to waybar, now my nextcloud sync icon shows

.config/waybar/config

@@ -12,7 +12,7 @@
     ],
 	"modules-right":
     [
-      "temperature",
+      "tray",
       "custom/temp2",
       "custom/notification",
       "custom/pacman",
@@ -185,6 +185,11 @@
     "critical-threshold": 80,
     "formate-critical": "{temperatureC}°C",
     "format": "{temperatureC}°C"
+  },
+
+  "tray": {
+    "icon-size": 18,
+    "spacing": 10
   }
 
 }

.config/waybar/style.css

@@ -150,3 +150,10 @@ tooltip label
   animation-name: blink-update;
   animation-duration: 3s;
 }
+
+#tray
+{
+  padding: 0 10px;
+  background-color: @primary_fg_color;
+  margin: 0 5px;
+}