Put Quantity Selector And Add To Cart Button On The Same Line ON MOBILE DEVICES In Craft Theme

[sweetjay]

Hey guys, I ran into a problem with the quantity selector on my product pages with mobile devices. Everything works perfectly on the PC and on certain phones for example Iphone 15 pro the add to cart button and the quantity selector are perfectly placed, but on certain phones the add to cart button changes position and it is very off. I will add a screenshot about the issue, This is how the page looks on an Iphone XS for example: 

This is how it looks on Iphone 15 Pro and on pc and how I would want it to look on ALL devices:

Is there a way to get the buttons to align on ALL mobile devices as well? And not only on the Iphone 15 Pro, as not all of our customers have that phone. Seems like this issue is happening on most phones. Thank you in advance!

[sweetjay]

Also on some phones this happens:

If anyone knows how to fix this, I would appreciate it a lot! Thank you in advance!