diff --git a/app/assets/stylesheets/darkswarm/shopping-cart.css.scss b/app/assets/stylesheets/darkswarm/shopping-cart.css.scss
index a20897fe2b..90e0fc276d 100644
--- a/app/assets/stylesheets/darkswarm/shopping-cart.css.scss
+++ b/app/assets/stylesheets/darkswarm/shopping-cart.css.scss
@@ -103,8 +103,10 @@
     }
   }
 
-  input.ng-invalid-stock {
-    border: 1px solid $clr-brick;
+  input {
+    &.ng-invalid-stock, &.ng-invalid-number {
+      border: 1px solid $clr-brick;
+    }
   }
 }