[aucisson_masque]

Firefox android : Setting -> accessibility -> zoom on all website.

I believe safari by default doesn't respect zoom rules set per website.

[kevindamm]

and on Chrome Android a workaround is to view as "Desktop site" (toggled in the browser's triple-dot menu) which still makes the text and buttons tiny but hey at least you can pinch-zoom (but unfortunately some panning may be necessary)

[Klathmon]

Chrome android has the same setting under settings > accessibility