This is a small UX thing that catches me every time I make an order…
After submitting an order, the Order Complete page has a red box saying ‘Thank you. Your order details have now been processed.’ The fact that a submitted order is followed by a page with a big red box always gives me the initial impression that the order has failed. The first time I almost went back to retry.
Switching the background colour of this box to match the other boxes on the page would make for a far better user experience!
Or is this just me?