Hello, hope you are well
the buy it now button goes off the page, it is too wide on the screen only on android phones eg samsung s20
on apple it shows as ‘pay with apple pay’ and this is perfect size.
Sorry you are facing this issue, it would be my pleasure to help you.
Welcome to the Shopify community! 
Thanks for your good question.
Please share your site URL,
I will check out the issue and provide you a solution here.