How to disable zooming in when entering text into my form? (Mobile)

Site URL: https://www.kanbeeapp.com/kanbee-earlyaccess-signup-banking-app

On the mobile version of our website, whenever we click on the form to write email it zooms in.  How do we prevent this? 

When this zooming happens what mobile device are you on? Brand? OS? OS version?

I suspect this could be a behaviour specific to the mobile device/OS and might be harder to eliminate.

I'm using an iPhone.  There is no zoom when I fill out forms on other websites, making me think it's not a mobile device issue. 

The issue is apparently a feature of iPhone, iOS, Safari. Please see...

Prevent iOS from zooming in on input fields

How To Prevent iPhone/iOS Devices From Zooming on Input Forms

Disable Auto Zoom in Input “Text” tag - Safari on iPhone

I'm not endorsing any of the fixes here. From what little I read no one had a real fix. Just workarounds all with various tradeoffs. I also don't know if they can be applied to a SS site.

Just tried these and not working, strange that this only happens on my website and doesn't zoom for other websites.  There's no custom css fix for this? 

Have you solved this yet?

Not yet, still zooming in on the form 

Bump, can anyone think of a solution?