Proceed to checkout

Greetings, i made an app with your plugin and i got a mayor issue.
When i get to the cart and try to proceed to checkout the button is not working. When i inspect the element i see that the button (<input …>) is display:none, when i change the display to something visible and click it, it redirects me to the checkout of my webpage instead of my app?

Also side question, when the cellphone that is opening the app isnt connected to the internet you see the page not found message, is there any way to add a simple HTML or something message please connect to the internet instead of getting the page not found ?

Thanks 🙂

https://wordpress.org/plugins/wordapp-mobile-app/