diff --git a/web/topbar/topbar.css b/web/topbar/topbar.css
new file mode 100644
--- /dev/null
+++ b/web/topbar/topbar.css
@@ -0,0 +1,4 @@
+.container {
+  border-bottom: 1px solid var(--border);
+  height: 60px;
+}
diff --git a/web/topbar/topbar.react.js b/web/topbar/topbar.react.js
new file mode 100644
--- /dev/null
+++ b/web/topbar/topbar.react.js
@@ -0,0 +1,13 @@
+// @flow
+
+import * as React from 'react';
+
+import css from './topbar.css';
+
+function Topbar(): React.Node {
+  return <div className={css.container}>dummy</div>;
+}
+
+const MemoizedTopbar: React.ComponentType<{}> = React.memo<{}>(Topbar);
+
+export default MemoizedTopbar;