Make the notification red (critical).

sunset-alarm

@@ -98,7 +98,7 @@ show_alert() {
     MESSAGE="Sunset is in ${MINUTES} minute(s)."
 
     persistent="-t 0 --wait"
-    icon="-i weather-clear"
+    icon="-i weather-clear -u critical"
 
     if command -v fyi >/dev/null 2>&1; then
         fyi $icon $persistent "$TITLE" "$MESSAGE"