Numbers on card fields appear dark on a dark background

Hello! In the checkout page when I try to ender card details the field background is black and entering numbers are dark violet. I have tried different CSS but they don’t change the color of numbers entered from dark violet to white for example. Could you please help finding the correct CSS code? This CSS code doesn’t impact front end if I edit it by changing the color to white or #fff

.ElementsApp,?.ElementsApp .InputElement?{
color: #31325F;
font-size: 15px;
}

The page I need help with: [log in to see the link]