diff --git a/app/assets/stylesheets/dialog.css b/app/assets/stylesheets/dialog.css
index 5d6a7eb0e..632d9af74 100644
--- a/app/assets/stylesheets/dialog.css
+++ b/app/assets/stylesheets/dialog.css
@@ -35,4 +35,11 @@
       }
     }
   }
+
+  /* Ensure padding from viewport edges on narrow screens */
+  @media (max-width: 639px) {
+    .dialog.panel {
+      max-inline-size: 94vw;
+    }
+  }
 }