Hi again,
Thanks for your feedback.
Please add this Custom CSS segments:
@media(max-width: 768px){
.woocommerce #respond input#submit, .woocommerce a.button, .woocommerce button.button, .woocommerce input.button, .woocommerce #respond input#submit.alt, .woocommerce a.button.alt, .woocommerce button.button.alt, .woocommerce input.button.alt, .woocommerce a.added_to_cart{
font-size:12px;
padding: 10px 10px;
min-width:40px !important;
}
}
If it still doesn't works, please give us your admin account privately. We will check on your website directly.
Best Regards,
Tracy - YoloTheme