diff --git a/models/ColorSettings.php b/models/ColorSettings.php
index 2e879fc..b9b56a3 100644
--- a/models/ColorSettings.php
+++ b/models/ColorSettings.php
@@ -246,7 +246,7 @@ public function saveVarsToFile()
               $vars = $vars .  '--' . $key . ':' . $value . ';';
         }
 
-        $additionalCss = Config::additionalCss();
+        $additionalCss = Config()->additionalCss();
 
         $content = ':root {' . $vars . $additionalCss . '}';