Excuse me but I'm well versed in CSS - in fact that used to be my speciality - graphics to CSS

The configuration setting says
CSS selector of the search input box(es). You might need to change it if you're using a custom template and the results dropdown is not showing.

Default: input[name="keyword"]

So where is the CSS? The default lists keyword for name - which my site has. That's not CSS. Do I change the name/keyword to class/whatever or div/whatever?