diff --git a/biophi/common/web/app_config.py b/biophi/common/web/app_config.py
index e3e2266..d6c1f96 100644
--- a/biophi/common/web/app_config.py
+++ b/biophi/common/web/app_config.py
@@ -18,4 +18,7 @@
 
 # Show newsletter popup at the bottom of landing page
 # using provided user/newsletter ID (something like c7bcd0367a4cdbbfe2ef413ff/c5b4d513538dcdb730f72a9db)
-MAILCHIMP_NEWSLETTER = os.environ.get('MAILCHIMP_NEWSLETTER')
\ No newline at end of file
+MAILCHIMP_NEWSLETTER = os.environ.get('MAILCHIMP_NEWSLETTER')
+
+# Optional banner HTML (will not be sanitized!)
+BANNER_HTML = os.environ.get('BANNER_HTML')
diff --git a/biophi/common/web/static/main.css b/biophi/common/web/static/main.css
index 1384bb6..9f31714 100644
--- a/biophi/common/web/static/main.css
+++ b/biophi/common/web/static/main.css
@@ -15,6 +15,19 @@
     color: rgba(255,255,255,.90);
 }
 
+.nav-custom-banner {
+    padding: 0.5rem 1rem;
+    color: white;
+}
+
+.nav-custom-banner a{
+    color: #a194f1;
+    text-decoration: underline;
+}
+.nav-custom-banner a:hover{
+    color: #c5bcff;
+}
+
 #header {
     background-position: center 80%;
     background-size: cover;
diff --git a/biophi/common/web/templates/layout.html b/biophi/common/web/templates/layout.html
index f8ad560..00164e0 100644
--- a/biophi/common/web/templates/layout.html
+++ b/biophi/common/web/templates/layout.html
@@ -41,6 +41,9 @@
           </div>
         </div>
         <div class="d-flex navbar-nav">
+          {% if BANNER_HTML %}
+            <span class="nav-custom-banner">{{ BANNER_HTML | safe }}</span>
+          {% endif %}
           <a href="#" class="nav-link" data-bs-toggle="modal" data-bs-target="#helpModal">Help</a>
         </div>
       </div>
diff --git a/biophi/common/web/views.py b/biophi/common/web/views.py
index f17b080..49d5998 100644
--- a/biophi/common/web/views.py
+++ b/biophi/common/web/views.py
@@ -33,6 +33,7 @@
 app.jinja_env.globals.update(sorted=sorted)
 app.jinja_env.globals.update(min=min)
 app.jinja_env.globals.update(max=max)
+app.jinja_env.globals.update(BANNER_HTML=app.config['BANNER_HTML'])
 
 app.register_blueprint(biophi_humanization, url_prefix='/humanization')