diff --git a/web/static/app.css b/web/static/app.css
index 2d25e6c..2f0afb6 100644
--- a/web/static/app.css
+++ b/web/static/app.css
@@ -87,6 +87,15 @@ code,kbd{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono
 .topbar-wrap{
   border-bottom:1px solid var(--border);
   background:#f8fafc;
+  position: sticky;
+  top: 0;
+  z-index: 1000;          /* stay above menus/content */
+}
+
+/* optional: add a shadow when scrolled */
+.topbar-wrap.is-scrolled{
+  box-shadow: 0 4px 16px rgba(0,0,0,.08);
+  border-bottom-color: transparent;
 }
 .topbar{
   max-width:1100px;margin:0 auto;padding:14px 16px;