.checkout-button.button.alt.wc-forward {
   color: #ffffff !important;
  font-weight: bold !important;
}
.checkout-button button alt wc-forward {
   color: #ffffff !important;
  font-weight: bold !important;
}
.button {
     color: #ffffff !important;
  font-weight: bold !important;
}
.update_cart {
       color: #ffffff !important;
  font-weight: bold !important;
}