Hi!
The best possible way in my opinion is to use a custom CSS with a media query, something like this:
[html]@media only screen and (max-width: 500px) {
input.orig,
input.autocomplete {
font-size: 16px !important;
}
input.orig::-webkit-input-placeholder {
font-size: 16px !important;
}
input.orig::-moz-placeholder {
font-size: 16px !important;
}
input.orig:-ms-input-placeholder {
font-size: 16px !important;
}
input.orig:-moz-placeholder {
font-size: 16px !important;
}
}[/html]