Halloween: css fixes

app/styles/holiday/halloween.scss

@@ -145,6 +145,23 @@
       }
     }
   }
+
+  .column-header > button.grouped,
+  .column-header > .btn.grouped {
+    color: #fff;
+
+    &:hover {
+      color: #fff;
+    }
+
+    &::before {
+      background-color: var(--brand-color);
+    }
+  }
+
+  .primary-navigation__wrapper .primary-navigation hr {
+    background: rgba(255, 255, 255, 0.5);
+  }
 }
 
 // Animations