Help with the button in the purchase page.

Site URL: https://www.aradia.io/offerings/p/elemental-quiz

Hi! So when i get to the checkout for an order the button has dark font and a dark background, which not how it is in the style settings. Squarespace has asked me to remove all CSS code to troubleshoot, but I've invested a lot of time and money on this template and I'm not too keen on doing that. 

Can someone help? The only way to get to this button is by starting the check out process. I've linked one of the products here. Thank you so much in advance for your help!

Hi,

You want to change button text to white?

Add to Design > Custom CSS

body.collection-type-products div.lightbox-inner input.button {
    color: white !important;
}