Text and Buttons Overwritten

Hello, I am using Woo Commerce with a custom integration to Worldpay (Vantiv). Everything works great except for the credit card form. This form is hosted by World Pay and iFramed in. It appears that the button text and text box descriptors are in white font on a white background. Is this something I can correct in the theme, possibly using the additional CSS property? I appreciate all the help over the last few weeks and would be happy to make a donation to get this to the final stages. You can see an example here: https://unplugspot.com/creditcardcss> You access the page by clicking below and then clicking, Place Order. https://unplugspot.com/checkout/order-pay/ Thanks, Tony