diff --git a/.github/workflows/deploy_dev.yml b/.github/workflows/deploy_dev.yml
index bf10aa1..7de6f99 100644
--- a/.github/workflows/deploy_dev.yml
+++ b/.github/workflows/deploy_dev.yml
@@ -20,6 +20,10 @@ jobs:
         with:
           submodules: recursive
 
+      - name: 💉 Inject Development Banner
+        run: |
+          cat ./development_banner.html >> ./src/themes/poison/layouts/partials/sidebar/sidebar.html
+
       # Build the static website with the provided docker-compose rules, overriding environment variables to build to /build/blog/dev
       # Note: /!\ we do not override HUGO_ENV or HUGO_ENVIRONMENT, this is done on purpose to avoid triggering themes' behavior which
       # are not intended for production and could present security risks
diff --git a/development_banner.html b/development_banner.html
new file mode 100644
index 0000000..b5323b4
--- /dev/null
+++ b/development_banner.html
@@ -0,0 +1,4 @@
+<div style="background-color:red; color: white; font-size: 2rem; text-align: center; position: fixed; width: 100%; margin-bottom: 50rem;">
+    THIS IS A DEVELOPMENT WEBSITE, please go to <a href="https://iscsc.fr" style="font-weight: bold; color:darkslategrey;">https://iscsc.fr</a>
+  </div>
+  
\ No newline at end of file