Hello, @Anas,
Your issue has been solved please check back to your site now after removing the browser cache, I have added the Custom CSS code under Theme Settings >> Theme Custom CSS >> Global CSS: https://postimg.cc/7GNMgZpg
.single-product button.add_to_cart_button.single_add_to_cart_button {
min-width: 30% !important;
}
Regards 8Themes Team.