diff --git a/HMI/nspanel.HMI b/HMI/nspanel.HMI
index bd56acb2..e2974a8e 100644
Binary files a/HMI/nspanel.HMI and b/HMI/nspanel.HMI differ
diff --git a/HMI/nspanel.tft b/HMI/nspanel.tft
index 9ed2e681..3a3b3ac5 100644
Binary files a/HMI/nspanel.tft and b/HMI/nspanel.tft differ
diff --git a/apps/nspanel-lovelace-ui/luibackend/controller.py b/apps/nspanel-lovelace-ui/luibackend/controller.py
index 96d245c7..4f35b4f1 100644
--- a/apps/nspanel-lovelace-ui/luibackend/controller.py
+++ b/apps/nspanel-lovelace-ui/luibackend/controller.py
@@ -1,5 +1,5 @@
 import datetime
-from helper import scale, pos_to_color
+from helper import scale, pos_to_color, rgb_dec565
 
 from pages import LuiPagesGen
 
@@ -111,7 +111,19 @@ class LuiController(object):
         # same value for both values will break sleep timer of the firmware
         if sleepBrightness==brightness:
             sleepBrightness = sleepBrightness-1
-        self._send_mqtt_msg(f"dimmode~{sleepBrightness}~{brightness}")
+
+        # background color
+        dbc = 0
+        defaultBackgroundColor = self._config.get("defaultBackgroundColor")
+        if type(defaultBackgroundColor) is str:
+            if defaultBackgroundColor == "ha-dark":
+                dbc = 6371
+            elif defaultBackgroundColor == "black":
+                dbc = 0
+        elif type(defaultBackgroundColor) is list:
+            dbc = rgb_dec565(defaultBackgroundColor)
+
+        self._send_mqtt_msg(f"dimmode~{sleepBrightness}~{brightness}~{dbc}")
         
     def calc_current_brightness(self, sleep_brightness_config):
         current_screensaver_brightness = 20
diff --git a/docs/config-overview.md b/docs/config-overview.md
index 4e002fd7..6c598864 100644
--- a/docs/config-overview.md
+++ b/docs/config-overview.md
@@ -65,6 +65,7 @@ key | optional | type | default | description
 `dateAdditionalTemplate` | True | string | `""` | Addional Text dispayed after Date, can contain a Homeassistant Template Example `" - {{ states('sun.sun') }}"`
 `timeAdditionalTemplate` | True | string | `""` | Addional Text dispayed below Time, can contain a Homeassistant Template
 `dateFormat` | True | string | `%A, %d. %B %Y` | date format used if babel is not installed
+`defaultBackgroundColor` | True | string | ha-dark | backgroud color of all cards, valid values: `black`, `ha-dark`
 `cards` | False | complex | | configuration for cards that are displayed on panel; see docs for cards
 `screensaver` | True | complex | | configuration for screensaver; see docs for screensaver
 `hiddenCards` | True | complex | | configuration for cards that can be accessed though navigate items; see docs for cards