How to remove light blue outline from Add to Cart hover?

-- url of the page with the problem -- : N/A

Is there a way to remove light blue outline hover when an item is added to the cart?

Hi,

Are you talking about the notification box displayed on the corner of the page when you click on the "add to cart" button ?
You can disable it with the settings in the HikaShop cart notification plugin via the Joomla plugins manager.
But if you're talking about something else, we would need more information to better understand the situation.