It seems to me like the class-pb-catalog.php file (lines 903-917) should be allowing me to make changes to the template and then to the CSS via:
if ( $overridden_template = locate_template( 'pb-catalog.php' ) ) {
load_template( $overridden_template, true );
But, I've tried all kinds of places to put the files (style-catalog.css and pb-catalog.php), but can't seem to make a change in anything without hacking the pressbooks core. Thoughts?
Thanks so much for any help.
Kelly