How to fix different font size in mobile browsers?

Question

HTML

Good afternoon!
As far as possible, I try to adapt the site-forum on an old engine for modern mobile browsers.
The essence of the problem is that the font of some forum elements is very small when viewed with Chrome from Android. But quite normal size when viewed with Chrome/Safari from iPhone. Although the font size is fixed.
Patient baliforum.ru
Here is an example of a portion of the main page from Android/Chrome joxi.ru/12Mxz36tKOBkmJ The
gray font on the left on the iPhone is even bigger than the red on the right. On Android, the opposite is true.
Tell me, plz, why is this happening? And how to make the site look the same on Android?

Answer 1

In head add:
If you need to increase the font on mobile, google css media query