css styling

Glad you like the plugin!

Yes, you can hardcode the form into the theme. In fact, that’s how we would expect most people to use it. You can use a conventional WordPress template tag:

facetious( array(
   ...
));

or you might prefer to use:

do_action( 'facetious', array(
   ...
));

as this won’t cause a PHP error if the plugin should ever be deactivated.

One of the options you can specify in that array of arguments is id: that would allow you to target the Facetious form in CSS.

The widget has a class facetious_form, which you could use, perhaps in conjunction with an ID for the particular sidebar.