diff --git a/lib/Controller/CssController.php b/lib/Controller/CssController.php
index cdbf11a..b48c35c 100644
--- a/lib/Controller/CssController.php
+++ b/lib/Controller/CssController.php
@@ -27,6 +27,8 @@ use OCP\AppFramework\Http\Response;
 use OCP\AppFramework\Http\TemplateResponse;
 use OCP\IRequest;
 use OCP\IUserSession;
+use OCA\Theming\ThemingDefaults;
+use OCA\SideMenu\Service\Color;
 
 class CssController extends Controller
 {
@@ -40,12 +42,30 @@ class CssController extends Controller
      */
     protected $user;
 
-    public function __construct(string $appName, IRequest $request, ConfigProxy $config)
+    /**
+     * @var ThemingDefaults
+     */
+    protected $theming;
+
+    /**
+     * @var Color
+     */
+    protected $color;
+
+    public function __construct(
+        string $appName,
+        IRequest $request,
+        ConfigProxy $config,
+        ThemingDefaults $theming,
+        Color $color
+    )
     {
         parent::__construct($appName, $request);
 
         $this->user = OC::$server[IUserSession::class]->getUser();
         $this->config = $config;
+        $this->theming = $theming;
+        $this->color = $color;
     }
 
     /**
@@ -90,23 +110,29 @@ class CssController extends Controller
 
         $isDarkMode = ($isAccessibilityAppEnabled && $isDarkThemeUserEnabled) || ($isBreezeDarkAppEnabled && $isBreezeDarkUserEnabled);
 
+        $primaryColor = $this->theming->getColorPrimary();
+        $lightenPrimaryColor = $this->color->adjustBrightness($primaryColor, 0.2);
+        $darkenPrimaryColor = $this->color->adjustBrightness($primaryColor, -0.2);
+        $darkenPrimaryColor2 = $this->color->adjustBrightness($primaryColor, -0.3);
+        $textColor = $this->theming->getTextColorPrimary();
+
         if ($isDarkMode) {
-            $backgroundColor = $this->config->getAppValue('dark-mode-background-color', '#333333');
-            $backgroundColorTo = $this->config->getAppValue('dark-mode-background-color-to', $backgroundColor);
-            $currentAppBackgroundColor = $this->config->getAppValue('dark-mode-current-app-background-color', '#444444');
-            $loaderColor = $this->config->getAppValue('dark-mode-loader-color', '#cccccc');
-            $textColor = $this->config->getAppValue('dark-mode-text-color', '#FFFFFF');
+            $backgroundColor = $this->config->getAppValue('dark-mode-background-color', $darkenPrimaryColor);
+            $backgroundColorTo = $this->config->getAppValue('dark-mode-background-color-to', $darkenPrimaryColor);
+            $currentAppBackgroundColor = $this->config->getAppValue('dark-mode-current-app-background-color', $darkenPrimaryColor2);
+            $loaderColor = $this->config->getAppValue('dark-mode-loader-color', $lightenPrimaryColor);
+            $textColor = $this->config->getAppValue('dark-mode-text-color', $textColor);
             $iconInvertFilter = abs($this->config->getAppValueInt('dark-mode-icon-invert-filter', '0')).'%';
             $iconOpacity = abs($this->config->getAppValueInt('dark-mode-icon-opacity', '100') / 100);
             $opener = $this->config->getAppValue('dark-mode-opener', 'side-menu-opener');
 
             $backgroundOpacity = dechex($this->config->getAppValueInt('dark-mode-background-color-opacity', '100') * 255 / 100);
         } else {
-            $backgroundColor = $this->config->getAppValue('background-color', '#333333');
-            $backgroundColorTo = $this->config->getAppValue('background-color-to', $backgroundColor);
-            $currentAppBackgroundColor = $this->config->getAppValue('current-app-background-color', '#444444');
-            $loaderColor = $this->config->getAppValue('loader-color', '#0e75ac');
-            $textColor = $this->config->getAppValue('text-color', '#FFFFFF');
+            $backgroundColor = $this->config->getAppValue('background-color', $darkenPrimaryColor);
+            $backgroundColorTo = $this->config->getAppValue('background-color-to', $darkenPrimaryColor);
+            $currentAppBackgroundColor = $this->config->getAppValue('current-app-background-color', $darkenPrimaryColor2);
+            $loaderColor = $this->config->getAppValue('loader-color', $lightenPrimaryColor);
+            $textColor = $this->config->getAppValue('text-color', $textColor);
             $iconInvertFilter = abs($this->config->getAppValueInt('icon-invert-filter', '0')).'%';
             $iconOpacity = abs($this->config->getAppValueInt('icon-opacity', '100') / 100);
             $opener = $this->config->getAppValue('opener', 'side-menu-opener');
diff --git a/lib/Service/Color.php b/lib/Service/Color.php
new file mode 100644
index 0000000..cf90dd6
--- /dev/null
+++ b/lib/Service/Color.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace OCA\SideMenu\Service;
+
+/**
+ * class Color.
+ *
+ * @author Simon Vieille <simon@deblan.fr>
+ */
+class Color
+{
+    /**
+     * @thanks https://stackoverflow.com/posts/54393956/revision
+     */
+    public function adjustBrightness(string $hexCode, float $adjustPercent): string
+    {
+        $hexCode = ltrim($hexCode, '#');
+
+        if (3 == strlen($hexCode)) {
+            $hexCode = $hexCode[0].$hexCode[0].$hexCode[1].$hexCode[1].$hexCode[2].$hexCode[2];
+        }
+
+        $hexCode = array_map('hexdec', str_split($hexCode, 2));
+
+        foreach ($hexCode as &$color) {
+            $adjustableLimit = $adjustPercent < 0 ? $color : 255 - $color;
+            $adjustAmount = ceil($adjustableLimit * $adjustPercent);
+
+            $color = str_pad(dechex($color + $adjustAmount), 2, '0', STR_PAD_LEFT);
+        }
+
+        return '#'.implode($hexCode);
+    }
+}
diff --git a/lib/Settings/Admin.php b/lib/Settings/Admin.php
index 8885c13..e7a2bab 100644
--- a/lib/Settings/Admin.php
+++ b/lib/Settings/Admin.php
@@ -26,6 +26,8 @@ use OCP\AppFramework\Http\TemplateResponse;
 use OCP\IL10N;
 use OCP\ILogger;
 use OCP\Settings\ISettings;
+use OCA\Theming\ThemingDefaults;
+use OCA\SideMenu\Service\Color;
 
 class Admin implements ISettings
 {
@@ -54,18 +56,32 @@ class Admin implements ISettings
      */
     private $categoryRepository;
 
+    /**
+     * @var ThemingDefaults
+     */
+    protected $theming;
+
+    /**
+     * @var Color
+     */
+    protected $color;
+
     public function __construct(
         IL10N $l,
         ILogger $logger,
         ConfigProxy $config,
         AppRepository $appRepository,
-        CategoryRepository $categoryRepository
+        CategoryRepository $categoryRepository,
+        ThemingDefaults $theming,
+        Color $color
     ) {
         $this->l = $l;
         $this->logger = $logger;
         $this->config = $config;
         $this->appRepository = $appRepository;
         $this->categoryRepository = $categoryRepository;
+        $this->theming = $theming;
+        $this->color = $color;
     }
 
     /**
@@ -73,29 +89,35 @@ class Admin implements ISettings
      */
     public function getForm()
     {
-        $backgroundColor = $this->config->getAppValue('background-color', '#333333');
-        $backgroundColorTo = $this->config->getAppValue('background-color-to', $backgroundColor);
+        $primaryColor = $this->theming->getColorPrimary();
+        $lightenPrimaryColor = $this->color->adjustBrightness($primaryColor, 0.2);
+        $darkenPrimaryColor = $this->color->adjustBrightness($primaryColor, -0.2);
+        $darkenPrimaryColor2 = $this->color->adjustBrightness($primaryColor, -0.3);
+        $textColor = $this->theming->getTextColorPrimary();
 
-        $darkModeBackgroundColor = $this->config->getAppValue('dark-mode-background-color', '#333333');
-        $darkModeBackgroundColorTo = $this->config->getAppValue('dark-mode-background-color-to', $darkModeBackgroundColor);
+        $backgroundColor = $this->config->getAppValue('background-color', $darkenPrimaryColor);
+        $backgroundColorTo = $this->config->getAppValue('background-color-to', $darkenPrimaryColor);
+
+        $darkModeBackgroundColor = $this->config->getAppValue('dark-mode-background-color', $darkenPrimaryColor);
+        $darkModeBackgroundColorTo = $this->config->getAppValue('dark-mode-background-color-to', $darkenPrimaryColor);
 
         $parameters = [
             'background-color' => $backgroundColor,
             'background-color-to' => $backgroundColorTo,
             'background-color-opacity' => $this->config->getAppValueInt('background-color-opacity', '100'),
-            'current-app-background-color' => $this->config->getAppValue('current-app-background-color', '#444444'),
-            'loader-color' => $this->config->getAppValue('loader-color', '#0e75ac'),
+            'current-app-background-color' => $this->config->getAppValue('current-app-background-color', $darkenPrimaryColor2),
+            'loader-color' => $this->config->getAppValue('loader-color', $lightenPrimaryColor),
             'icon-invert-filter' => $this->config->getAppValueInt('icon-invert-filter', '0'),
             'icon-opacity' => $this->config->getAppValueInt('icon-opacity', '100'),
-            'text-color' => $this->config->getAppValue('text-color', '#FFFFFF'),
+            'text-color' => $this->config->getAppValue('text-color', $textColor),
             'dark-mode-background-color' => $darkModeBackgroundColor,
             'dark-mode-background-color-to' => $darkModeBackgroundColorTo,
             'dark-mode-background-color-opacity' => $this->config->getAppValueInt('dark-mode-background-color-opacity', '100'),
-            'dark-mode-current-app-background-color' => $this->config->getAppValue('dark-mode-current-app-background-color', '#444444'),
-            'dark-mode-loader-color' => $this->config->getAppValue('dark-mode-loader-color', '#cccccc'),
+            'dark-mode-current-app-background-color' => $this->config->getAppValue('dark-mode-current-app-background-color', $darkenPrimaryColor2),
+            'dark-mode-loader-color' => $this->config->getAppValue('dark-mode-loader-color', $textColor),
             'dark-mode-icon-invert-filter' => $this->config->getAppValueInt('dark-mode-icon-invert-filter', '0'),
             'dark-mode-icon-opacity' => $this->config->getAppValueInt('dark-mode-icon-opacity', '100'),
-            'dark-mode-text-color' => $this->config->getAppValue('dark-mode-text-color', '#FFFFFF'),
+            'dark-mode-text-color' => $this->config->getAppValue('dark-mode-text-color', $textColor),
             'dark-mode-opener' => $this->config->getAppValue('dark-mode-opener', 'side-menu-opener'),
             'opener' => $this->config->getAppValue('opener', 'side-menu-opener'),
             'loader-enabled' => $this->config->getAppValue('loader-enabled', '1'),