diff --git a/share/jupyterhub/templates/page.html b/share/jupyterhub/templates/page.html
index 5677eb93..70c733e5 100644
--- a/share/jupyterhub/templates/page.html
+++ b/share/jupyterhub/templates/page.html
@@ -148,7 +148,7 @@
 
 {% block announcement %}
 {% if announcement %}
-<div class="container text-center announcement">
+<div class="container text-center announcement alert alert-warning">
   {{ announcement | safe }}
 </div>
 {% endif %}