diff --git a/web/css/08-nav-bar.css b/web/css/08-nav-bar.css
index f856538..bb5a438 100644
--- a/web/css/08-nav-bar.css
+++ b/web/css/08-nav-bar.css
@@ -94,3 +94,9 @@
   position: absolute;
   inset: -2px;
 }
+/* Inverts rather than tinting, so the ADD slot reads as active the same way
+   the display toggle and the segment buttons do. */
+.tab-add.is-active {
+  background: var(--ink-fixed);
+  color: var(--cream-fixed);
+}