iPhone zoom on Search input box

[gupp41]

When using iPhone and clicking the "Search" magnifying glass icon in Blockify, the device zooms in on the search box, and remains zoomed in even after leaving the input box. This is due to a well-known issue/functionality of iPhone that zooms into inbox boxes whose text size is less than 16.
Can we increase the default text size of the search box to 16, or otherwise how can it be done on a case-by-case basis if the user chooses?

To reproduce:
Open a Wordpress site with Blockify theme using iOS device.
Click the Search button to open the input box.
Start typing something.