I have code in my <style> tag at the top of our email code to adjust mobile text size. It has worked for 2 years, and I just realized it's no longer adjusting the text size on older iPhones (mine is a 6s and it is not rendering correctly anymore. The code I've used was:

body {-webkit-text-size-adjust: 100%; -ms-text-size-adjust: 100%; margin: 0px auto !important; padding: 0 !important;}

Has anyone else seen a recent change in functionality on mobile and have a solution?

thank you!