Hello,
Use the below code
.et-quick-view-wrapper .quick-view-excerpts .excerpt-title,
.et-quick-view-wrapper .quick-view-excerpts .excerpt-content-inner h1, .mfp-close-btn-in .et-quick-view-wrapper .mfp-close, .et-quick-view-wrapper .arrows-hovered .sm-arrow,
.et-quick-view-wrapper .arrows-hovered>.swiper-container .swiper-custom-left,
.et-quick-view-wrapper .arrows-hovered>.swiper-container .swiper-custom-right {
color: white !important;
}
2) If you don’t use variation swatches for this product but default select then you need to go to a single product to choose the option and then add the product to the cart. You can change text using WooCommerce translation files https://prnt.sc/1t48y2v
Check now.
Regards