Custom button not inheriting css.

Hi there,

I am using the custom button option. No matter what style I choose -the button's style does not change. How can I fix this?

Additionally, where should I add "display:hidden" to the css in order to hide the Donation: $1 text right above the button? I want the donation amount to be sent to paypal -but do not want to dispaly that text on my website (the text of the button is "Donate One Dollar").

Thank you for your time and help,
Andrew