diff --git a/internal/webapi/templates/header.html b/internal/webapi/templates/header.html
index 40ac1d1..7ff8973 100644
--- a/internal/webapi/templates/header.html
+++ b/internal/webapi/templates/header.html
@@ -67,7 +67,7 @@
 
             {{ if .WebApiCfg.Debug }}
                 <div class="container">
-                    <div class="alert alert-warning my-2">
+                    <div class="alert alert-danger my-2 w-100 text-center font-weight-bold">
                         Web server is running in debug mode - don't do this in production!
                     </div>
                 </div>