Thanks.
Here, the following CSS is working in all of my browsers:
[html]
input.autocomplete {
padding: 0 6px !important;
}
input.orig {
color: #b40808 !important;
padding: 0 6px !important;
font-size: 14px !important;
}
[/html]
It changes the font size, color and fixes the paddig forced by the theme.