Can't Read Text After Pressing "Add to Cart"

Hello, I used some shortcodes to come up with my store page? I am using MarketPress the latest version from you 2.8.1. However when I press the “Add To Cart” Green Button it displays a box momentarily which is very hard to read and then that box goes away. Can you give me the correct CSS code to override the text colors so that I can see what it says. Go ahead and test this yourself on this site: