Hello,
Custom CSS code can be used. For example:
.woocommerce-order-received .woocommerce-order-overview li strong, .woocommerce-order-received .shop_table .amount, .woocommerce-order-received .wc-item-meta li {
color: white;
}
add the code in Theme Options > Theme custom CSS.
To find out classes, inspect code using inspector tools.
Open a web page in Google Chrome. Either:
-Select the Chrome menu at the top-right of your browser window, then select Tools > Developer Tools.
-Right-click on any page element and select Inspect Element.
The DevTools window will open at the bottom of your Chrome browser.
Regards