Hello,
Sorry for the earlier inconvenience. As you mentioned it is on the Thank You page, so we have modified our earlier CSS and applied the following one to change the Background and Text Color of the Button along with th Font Size:
.woocommerce-order-received .woocommerce-order-details .button-primary {
background: #1246ab !important;
color: #fff !important;
font-size: 1em !important;
font-family: 'VI_WN_ICON_CLOSE' !important;
}
Location to find the applied Custom CSS is the same as told earlier:
You can change the Color Hex Code and Font Size value according to your choice. We have just added it as an exemplary.
Best Regards