diff --git a/apps/web/src/index.css b/apps/web/src/index.css
index 30bc1c0268975..40e1cff0197d3 100644
--- a/apps/web/src/index.css
+++ b/apps/web/src/index.css
@@ -2305,6 +2305,15 @@ code {
   overflow: visible;
 }
 
+/* Keep overflow discoverable when the edge fade falls between columns. */
+.chat-markdown
+  .chat-markdown-table-container
+  [data-slot="scroll-area-scrollbar"][data-orientation="horizontal"] {
+  opacity: 1;
+  --app-scrollbar-thumb: color-mix(in srgb, var(--muted-foreground) 60%, transparent);
+  --app-scrollbar-thumb-hover: color-mix(in srgb, var(--muted-foreground) 80%, transparent);
+}
+
 :root {
   --diff-addition: var(--success);
   --diff-deletion: var(--destructive);