Larger font size on time input

[Haroenv]

Currently the input of the time is slightly smaller than the other inputs. On mobile (maybe only iOS) inputs with font sizes lower than 16px get zoomed in and requires the user to zoom out again after using that input.

This is fixed by giving those two inputs the same font size as the other inputs.

This is related to #228 but easier to implement and will also give a UX bump.