diff --git a/services/web/frontend/js/features/pdf-preview/components/pdf-hybrid-theme-button.tsx b/services/web/frontend/js/features/pdf-preview/components/pdf-hybrid-theme-button.tsx
index 188adf6eed..c0ee61ccef 100644
--- a/services/web/frontend/js/features/pdf-preview/components/pdf-hybrid-theme-button.tsx
+++ b/services/web/frontend/js/features/pdf-preview/components/pdf-hybrid-theme-button.tsx
@@ -8,6 +8,7 @@ export const PdfHybridThemeButton = () => {
   const id = useId()
   const { t } = useTranslation()
   const {
+    pdfUrl,
     pdfViewer,
     darkModePdf,
     setDarkModePdf,
@@ -19,12 +20,14 @@ export const PdfHybridThemeButton = () => {
     setDarkModePdf(!darkModePdf)
   }, [darkModePdf, setDarkModePdf])
 
+  const isHtmlOutput = pdfUrl?.includes('output.html')
+
   if (activeOverallTheme !== 'dark') {
     return null
   }
 
-  if (pdfViewer !== 'pdfjs') {
-    // We can't affect the theme of the embedded viewer
+  if (pdfViewer !== 'pdfjs' && !isHtmlOutput) {
+    // We can't affect the theme of the embedded native viewer
     return null
   }
 
diff --git a/services/web/frontend/js/features/pdf-preview/components/pdf-preview-pane.tsx b/services/web/frontend/js/features/pdf-preview/components/pdf-preview-pane.tsx
index 8482554013..aef48227a4 100644
--- a/services/web/frontend/js/features/pdf-preview/components/pdf-preview-pane.tsx
+++ b/services/web/frontend/js/features/pdf-preview/components/pdf-preview-pane.tsx
@@ -20,8 +20,11 @@ function PdfPreviewPane() {
     activeOverallTheme,
   } = useCompileContext()
   const { compileTimeout } = getMeta('ol-compileSettings')
+  const isHtmlOutput = pdfUrl?.includes('output.html')
   const darkModePdf =
-    pdfViewer === 'pdfjs' && activeOverallTheme === 'dark' && darkModeSetting
+    (pdfViewer === 'pdfjs' || isHtmlOutput) &&
+    activeOverallTheme === 'dark' &&
+    darkModeSetting
 
   const classes = classNames('pdf', 'full-size', {
     'pdf-empty': !pdfUrl,
diff --git a/services/web/frontend/stylesheets/pages/editor/pdf.scss b/services/web/frontend/stylesheets/pages/editor/pdf.scss
index 46504b49fb..32f3ab14f0 100644
--- a/services/web/frontend/stylesheets/pages/editor/pdf.scss
+++ b/services/web/frontend/stylesheets/pages/editor/pdf.scss
@@ -204,6 +204,10 @@
         filter: invert(95%) hue-rotate(180deg) brightness(90%) contrast(90%);
       }
     }
+
+    .pdf-viewer iframe {
+      filter: invert(95%) hue-rotate(180deg) brightness(90%) contrast(90%);
+    }
   }
 }