Change font size of inputs to 1rem on mobile

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To reproduce:

1. On a mobile device or in a simulated iPhone in the Simulator app on macOS, tap a text field to focus it
2. When the text field focuses, the mobile browser will zoom in, because the font size of the input is < 16px/1rem

Recommended interventions:

1. We should use font-size: 1rem; for all inputs and textareas on mobile devices. This is a broad solution that is outside the scope of groupproduct planning and needs Pajamas team alignment