Dummy product is still shown even after adding CSS

I've entered the css code but the dummy product is still showing on the form.

Are you referring to the form https://form.jotform.com/202596066277261?

If yes, I can see that you have added a product with a value of $0.01. To remove this product, you do not need a CSS code. You can directly remove that product from the payment settings.

You can change your payment type to "User-defined amount" which will allow users to enter the amount. This will automatically remove the dummy product.

Please review and let us know if this is what you are looking for.

Else, please let us know how you want to configure/customize your payment field.