Order Summary Page using flexbox

There is an issue with overflow where the change anchor tag escapes it's flex container on my friends iPhone 14 using safari but I'm unable to replicate the issue with any dev tools or other browsers and do not have my own iPhone to test with. On a variety of different android devices using chrome this issue does not exist and it only exists in Firefox when the width is reduced below 280px.

If anyone can help look over my flex containers and items and give me feedback if I've implemented and used them correctly or if there is a better and more efficient way I could have used them please give me critique here so I can improve my skills using flex.