diff --git a/packages/desktop-client/src/components/settings/ThemeInstaller.tsx b/packages/desktop-client/src/components/settings/ThemeInstaller.tsx
index 464e5df449..c418992a3e 100644
--- a/packages/desktop-client/src/components/settings/ThemeInstaller.tsx
+++ b/packages/desktop-client/src/components/settings/ThemeInstaller.tsx
@@ -375,6 +375,7 @@ export function ThemeInstaller({
           aria-label={t('Custom Theme CSS')}
           style={{
             height: 120,
+            resize: 'vertical',
           }}
         />
         <View
diff --git a/upcoming-release-notes/6695.md b/upcoming-release-notes/6695.md
new file mode 100644
index 0000000000..e6f9c4ba19
--- /dev/null
+++ b/upcoming-release-notes/6695.md
@@ -0,0 +1,6 @@
+---
+category: Bugfix
+authors: [MatthiasBenaets]
+---
+
+Limit custom css textarea to resize vertically