diff --git a/.env.development b/.env.development
index b48ce7c..7097952 100644
--- a/.env.development
+++ b/.env.development
@@ -6,6 +6,6 @@ NEXT_PUBLIC_USE_MOCK_BACKEND_LOOP_START=false
 NEXT_PUBLIC_EXPORT_STATIC=false
 NEXT_PUBLIC_USE_CGI=false
 # App-Versionsnummer
-NEXT_PUBLIC_APP_VERSION=1.6.899
+NEXT_PUBLIC_APP_VERSION=1.6.900
 NEXT_PUBLIC_CPL_MODE=json   # json (Entwicklungsumgebung) oder jsSimulatedProd (CPL ->CGI-Interface-Simulator) oder production (CPL-> CGI-Interface Platzhalter)
 
diff --git a/.env.production b/.env.production
index c719e96..71852d4 100644
--- a/.env.production
+++ b/.env.production
@@ -5,5 +5,5 @@ NEXT_PUBLIC_CPL_API_PATH=/CPL
 NEXT_PUBLIC_EXPORT_STATIC=true
 NEXT_PUBLIC_USE_CGI=true
 # App-Versionsnummer
-NEXT_PUBLIC_APP_VERSION=1.6.899
+NEXT_PUBLIC_APP_VERSION=1.6.900
 NEXT_PUBLIC_CPL_MODE=production
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d156d1a..4e9c7e3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## [1.6.900] – 2025-09-10
+
+- style: Detailansicht Modal dark mode
+
+---
 ## [1.6.899] – 2025-09-10
 
 - style: AnalogInputsChartModal dark mode
diff --git a/components/header/Header.tsx b/components/header/Header.tsx
index f5d3a45..6ded32b 100644
--- a/components/header/Header.tsx
+++ b/components/header/Header.tsx
@@ -145,7 +145,7 @@ function Header() {
   }, []);
 
   return (
-    <header className="bg-[var(--color-surface)] dark:bg-[var(--color-surface)]/90 backdrop-blur flex justify-between items-center w-full h-[13vh] laptop:h-[10vh] relative text-[var(--color-fg)] dark:text-[var(--color-fg)] shadow-sm border-b border-[var(--color-border)]">
+  <header className="bg-[var(--color-surface-alt)] dark:bg-[var(--color-surface-alt)] flex justify-between items-center w-full h-[13vh] laptop:h-[10vh] relative text-[var(--color-fg)] shadow-sm border-b border-base theme-transition">
       <div
         className="absolute transform -translate-y-1/2 
                 left-[8%] sm:left-[8%] md:left-[8%] lg:left-[8%] xl:left-[6%] 2xl:left-[2%] laptop:left-[4%] laptop:
diff --git a/package-lock.json b/package-lock.json
index c8f908f..44e5d6f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "cpl-v4",
-  "version": "1.6.899",
+  "version": "1.6.900",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "cpl-v4",
-      "version": "1.6.899",
+      "version": "1.6.900",
       "dependencies": {
         "@emotion/react": "^11.13.0",
         "@emotion/styled": "^11.13.0",
diff --git a/package.json b/package.json
index c95ea1d..1b98b7d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cpl-v4",
-  "version": "1.6.899",
+  "version": "1.6.900",
   "private": true,
   "scripts": {
     "dev": "next dev -p 3000",