Add To Cart misaligned in mobile view

Hello,

I am having an issue with button alignment in mobile view. I’ve started developing this site as a test site, the url is:

https://www.test.fsportswear.com/

The issue I am having is, I added some custom CSS around to compensate for the Add To Cart buttons not properly aligning under the associated images (in this case it’s the “Select Options” buttons, but I believe the rules for the two buttons are the same). That worked for the monitor view of my site, but now when I go to the site on my Iphone or Ipad, the “Select Options” buttons on the product category pages are all misaligned. Can anyone help me with this?